What is the value of the expression 5y + 4x when x = 2.5 and y = 3?

Mathematics Middle School

What is the value of the expression 5y ² + 4x when x = 2.5 and y = 3?

Answers

Answer 1

Answer:

The answer is 40

Step-by-step explanation:

5*3=15

15*2=30

4*2.5=10

So 30+10=40

Hope this helps!!

Answer 2

Answer:

y= 225 and x= 10

Step-by-step explanation:

You will have to replace y with 3 so it will be 5 times 3 then 15 to the second power to get 225. Now replace a with 2.5 to do 4 times 2.5 to equal 10.

Related Questions

Without using a calculator, convert the fraction to a decimal.
2/4=?

Answers

Divide 2 into 4,

So .50

To convert the fraction 2/4 to a decimal, we can perform the division 2 divided by 4 using long division or mental math.

2 ÷ 4 = 0.5

Therefore, 2/4 as a decimal is 0.5.

A fruit juice recipe calls for 2 parts orange juice and 8 parts pineapple juice. Which proportion can be used to find the amount of orange juice, j, that is needed to add to 18 L of pineapple juice?

2 over 8 equals j over 18
8 over 2 equals j over 18
8 over j equals 2 over 18
16 over 18 equals j over 100

Answers

The correct proportion to use to find the amount of orange juice, j, needed to add to 18 L of pineapple juice is:

2/8 = j/18

This proportion relates the ratio of orange juice to pineapple juice in the recipe (2:8) to the amount of orange juice needed to add to 18 L of pineapple juice. By cross-multiplying, we can solve for j as follows:

2/8 = j/18

218 = 8j

36 = 8*j

j = 36/8

j = 4.5

Therefore, you would need to add 4.5 L of orange juice to 18 L of pineapple juice to create the fruit juice recipe that calls for a ratio of 2 parts orange juice to 8 parts pineapple juice.

Answer:

2 over 8 equals j over 18

Step-by-step explanation
2 over 8 equals j over 18

This proportion represents the ratio of orange juice to pineapple juice in the recipe. By setting up the proportion, we can solve for the value of 'j,' which represents the amount of orange juice needed.

So, the correct proportion is:

2 over 8 equals j over 18

Help me plsssssssssss

Answers

Answer:

It is 1404

18720

Step-by-step explanation:

234
x 86
=
1404 ( first one )
+ 18,720 (Second )

1404
+18,720
————
20,124

hope this help sorry i’m late

Rectangle Q has an area of 2 square units. Thea drew a scaled version of Rectangle Q and labelled it Rectangle R.

What scale factor did Thea use to go from Rectangle Q to Rectangle R?

Rectangle R is 8 by 9

Answers

Answer:

Step-by-step explanation:

It is given that Rectangle Q has an area of 2 square units.

Thea Drew a scaled version of Rectangle Q and marked it as R.

As you must keep in mind If we draw scaled copy of pre-image, then the two images i.e Pre-image and Image are similar.

As you have not written what is the scale factor of transformation

Suppose , Let the Scale factor of transformation= k

Rectangle Q = Pre -image, Rectangle R= Image

If, Pre-Image < Image , then scale factor is k >1.

But If, Pre-Image > Image , then Scale factor will be i.e lies between, 0<k<1.

The stem-and-leaf plot displays data collected on the size of 15 classes at two different schools.

Mountain View School Seaside School
0 5, 8
9, 8, 2, 0 1 0, 1, 2, 5, 6, 8
8, 7, 6, 5, 5, 4, 4, 3, 1, 0 2 5, 5, 7, 7, 8
0 3 0, 6
Key: 2 | 1 | 0 means 12 for Mountain View and 10 for Seaside

Part A: Calculate the measures of center. Show all work. (2 points)

Part B: Calculate the measures of variability. Show all work. (1 point)

Part C: If you are interested in a smaller class size, which school is a better choice for you? Explain your reasoning. (1 point)

Answers

To calculate the measures of center, we need to find the mean and median for each school.

For Mountain View School:
Data: 0, 0, 0, 0, 1, 2, 3, 4, 4, 5, 5, 5, 5, 6, 7, 8, 8, 8, 9
Mean: (0 + 0 + 0 + 0 + 1 + 2 + 3 + 4 + 4 + 5 + 5 + 5 + 5 + 6 + 7 + 8 + 8 + 8 + 9) / 19
= 100 / 19
≈ 5.26

To find the median, we need to arrange the data in ascending order: 0, 0, 0, 0, 1, 2, 3, 4, 4, 5, 5, 5, 5, 6, 7, 8, 8, 8, 9.
The median is the middle value, which is the 10th value in this case.
Median: 5

For Seaside School:
Data: 0, 0, 0, 1, 1, 2, 2, 4, 5, 5, 5, 5, 6, 7, 7, 8, 8, 8, 9
Mean: (0 + 0 + 0 + 1 + 1 + 2 + 2 + 4 + 5 + 5 + 5 + 5 + 6 + 7 + 7 + 8 + 8 + 8 + 9) / 19
= 80 / 19
≈ 4.21

To find the median, we need to arrange the data in ascending order: 0, 0, 0, 1, 1, 2, 2, 4, 5, 5, 5, 5, 6, 7, 7, 8, 8, 8, 9.
The median is the middle value, which is the 10th value in this case.
Median: 5

Now let's calculate the measures of variability, specifically the range and interquartile range (IQR).

Range: The range is the difference between the largest and smallest values in the dataset.

For Mountain View School:
Range: 9 - 0 = 9

For Seaside School:
Range: 9 - 0 = 9

Interquartile Range (IQR): The IQR is the difference between the third quartile (Q3) and the first quartile (Q1) and measures the spread of the middle 50% of the data.

For Mountain View School:
Q1 = 3
Q3 = 7
IQR = Q3 - Q1 = 7 - 3 = 4

For Seaside School:
Q1 = 2
Q3 = 7
IQR = Q3 - Q1 = 7 - 2 = 5

To determine which school is a better choice for a smaller class size, we can consider both the mean and the median.

Both the mean and median for Mountain View School are higher than those for Seaside School. This suggests that, on average, the class sizes at Mountain View School are larger than those at Seaside School. Therefore, if you are interested in a smaller class size, Seaside School would be a better choice

Part A:

For Mountain View School:
- Median: The median class size is the middle value, which is 25.
- Mean: The mean class size is the sum of all the class sizes divided by the total number of classes, which is (29 + 28 + 28 + 27 + 25 + 24 + 24 + 23 + 21 + 20 + 19 + 18 + 15 + 13 + 10) / 15 = 21.27.

For Seaside School:
- Median: The median class size is the middle value, which is 20.
- Mean: The mean class size is the sum of all the class sizes divided by the total number of classes, which is (25 + 25 + 27 + 27 + 28 + 28 + 28 + 30 + 31 + 35 + 36 + 38 + 40 + 43 + 45) / 15 = 31.13.

Part B:

For Mountain View School:
- Range: The range is the difference between the largest and smallest values, which is 29 - 10 = 19.
- Interquartile Range (IQR): The IQR is the difference between the third quartile (Q3) and the first quartile (Q1). From the stem-and-leaf plot, we can see that Q1 is 20 and Q3 is 28. Therefore, the IQR is 28 - 20 = 8.

For Seaside School:
- Range: The range is the difference between the largest and smallest values, which is 45 - 25 = 20.
- Interquartile Range (IQR): The IQR is the difference between the third quartile (Q3) and the first quartile (Q1). From the stem-and-leaf plot, we can see that Q1 is 27 and Q3 is 38. Therefore, the IQR is 38 - 27 = 11.

Part C:

If you are interested in a smaller class size, Mountain View School is a better choice for you because it has a lower mean and median class size than Seaside School.

Scott's gas tank is 1/3 full. After he buys 12 gallons of gas, it is 7/9 full. How many gallons can Scott's tank hold?

Answers

Answer: We start with the variable "x". Let's call "x" Dan's full tank.

So we know that right now he has 1/3x or 1/3 of a full tank.

After adding 12 gallons, at the end, he has 7/9x, or 7/9 of a full tank

So we start with

(1/3)x + 12 = 7/9x

Let's subtract 1/3x from both sides

12 = 7/9x - 1/3x

Remember, we need to use common denominators to subtract, so 1/3 becomes 3/9

12 = 7/9x - 3/9x

Now we simplify to get

12 = 4/9x

Multiply the reciprocal of 4/9 to both sides which is 9/4

12 * 9/4 = x

Answer is 27 gallons.

Brainliest + 35 Points

In every circle, there is a special relationship between the circumference and the diameter. Determine the decimal value of the ratio of the circumference to the diameter to the nearest hundredth for each circle. Recall that the fraction bar represents division.

Answers

Answer:

Step-by-step explanation:

Circles are all similar, and "the circumference divided by the diameter" produces the same value regardless of their radius. This value is the ratio of the circumference of a circle to its diameter and is called π (Pi).

Answer:

It's 3.14 for each one.

Explanation: The value of pi is 3.14, and it doesn't change depending on the size of the circle. You're welcome! :)

An American traveling in Japan wishes to exchange American money for Japanese money. If the exchange rate is $1 = 80 yen, then how many dollars will the traveler need to purchase 10,000yen?

Answers

Answer: $125

Step-by-step explanation:

1/80=x/10,000

10,000/80=125

Hope this helped!

Answer:125 yen

Step-by-step explanation:
Ratio and proportion

Ratio=1:80=x:10,000

x represents dollars which is unknown

1/80=x/10,000

Then you cross multiply

80x=10,000

80x/80=10,000/80

x=125

Therefore,$125 will give you 10,000yen

simplify the expression. 5/9z−6/9z+4−7/9z−9

Answers

Answer:

− 5 − 8 z/9

Step-by-step explanation:

Hope this helps!!!

Answer:

-8/9 z-5

Step-by-step explanation:

Let's simplify step-by-step.

5/9z−6/9z+4−7/9z−9

5/9 z+−2/3 z+4+−7/9 z+−9

Combine Like Terms:

5/9 z+ −2/3 z+4+−7/9 z+−9

(5/9 z+−2/3 z+−7/9z)+(4+−9)

−8/9 z+−5

Answer:

−8/9 z−5

Good luck! ;)

I don’t understand how to do this. “Finding the absolute value of an expression”

Answers

Answer:

To find the absolute value of an expression think of every number as a positve one. So if you see a number in parenthesis that is negative, make it a positive and then solve! If a number is already positive, it is already in its absolute value form.

For example:

(-4) + (2)= ?

We know that every number has to be positive to be absolute value so we would make -4 a 4 and 2 is already in absolute value so we will keep it as it is and solve.

4-2=?

Now we will solve the expression as normally which would be 2. Hope this helps!

Step-by-step explanation:

Answer:

So from what I see on the screen you have to find more than one way to solve for each problem but first you need to know what you are trying to solve for so lets go to the second problem

15+6

so 15 + 6 = 21 and now you can put 21 at the right end and in the middle you would make 2 different problems to put in the middle like 10+11 and 3 x 7

so it would look like this for the second one

[15+6] = 10+11 = 3 x 7 = 21

I hope this helps you and good luck. :D

please help ill give brainliest

Answers

Answer:

She spent over $3.00 .

If i'm wrong sorry I didn't get the Question

3.47x 10 to the power of 4

Answers

3.47x 10 to the power of 4= 34,700

The answer is 34,700

A biker traveled 24 miles in 6 hours. A unit rate to describe this would be 4 miles per hour. What is another unit rate in this situation? 1 over 4 hour per mile 1 over 4 mile per hour 1 mile per hour 4 hours per mile

Please help!!!

Answers

Answer:

(1/4) hr/mile

Step-by-step explanation:

4 mph can be rewritten using other units of measurement:

Suppose we convert 'miles' to 'feet:'

Then:

4 miles 5280 ft

---------- * ------------- = 21120 ft/hr

1 hr 1 mile

Note that we could invert 4 mph and obtain

1 hr

-------- or (1/4) hr/mile

4 mi

1/4 hr mile!!!!!! Hope that this helps you! Have a good day

The expression 2(l + w) is used to calculate the perimeter of a rectangle, where l is length and w is width. If the length is Fraction 2 over 3 unit and the width is Fraction 1 over 3 unit, what is the perimeter of the rectangle in units? (3 points)

Group of answer choices

Fraction 2 over 3 unit

1 unit

1 Fraction 2 over 3 units

2 units

Answers

Answer:

1 unit

Step-by-step explanation:

The expression 2(l + w) is used to calculate the perimeter of a rectangle, where l is length and w is width. If the length is 2/3 unit, and the width is 1/3 unit, what is the perimeter of the rectangle in units?

perimeter = 2(l + w)

perimeter = 2(2/3 + 1/3)

perimeter = 2(3/3) = 2(1)

perimeter = 1

Answer: 1 unit

Answer:1 Fraction 2 over 3 units

Step-by-step explanation: take your time

A straight line is a function if it can be written in the form y = mx + b.

Question 1 options:
True
False

Answers

True that’s the answer

The answer is True. Hope this helps

Math question someone pls explain how to answer it I am stuck pt.6

Answers

Answer:

1/5 or 20%

Step-by-step explanation:

Probability = favorable outcomes

total num. of outcomes

Probability = 2

Find the GCF, 2.

2 ÷ 2 = 1

10 ÷ 2 = 5

1/5

sorry if it's wrong

Answer:

The probability of choosing a green shirt is 20%=1/5=.2

Step-by-step explanation:

find the total amount = 10

Find the total of question (probability of choosing green) = 2

set as a fraction:

Numerator = amount needed (2)

Denominator = all things/objects involved (10)

PS*

With probability there is a good chance the answer is going to be less than 1 or 100%, knowing that can help to tell which number goes in what place of the fraction

ex:

10/2=5=500% (this can't be the answer)

So Flip it 2/10=.2=20% (This seems more of a reasonable answer)

At a recent football game of 8,450 in attendance, 150 people were asked what they prefer on a hot dog. The results are shown.

Ketchup Relish Chili
54 36 60

Based on the data in this sample, how many of the people in attendance would prefer ketchup on a hot dog?
4,225
3,380
3,127
3,042

Answers

By proportion that is:(54/150) * 8450= 54 * 56 1/3= 3042

Answer:

By proportion that is:(54/150) * 8450= 54 * 56 1/3= 3042

Step-by-step explanation:

If you add 15 calls and multiple them by the total of 67 keeps and there is only one 1 Jeep subtract that by 56 and add 100 divide by 6 how many would it be

Answers

Answer:

IT would give you a decimal whis is 966.66666666667

Step-by-step explanation:

15*67+1-56+100/6

I got 964.666 I don’t know if that is right or not but I hope it is

I NEED THIS NOW!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
For each of the figures, write Absolute Value equation in the form

|x−c=d|, where c and d are some numbers, to satisfy the given solutions:

Answers

point c is at -4 and point d is at -8

C is -4 and D is -8 where c and d r some numbers!

In the given equation, a, b and c are nonzero rational numbers.
a times b = c
Given this equation, enter one number from the choices below into each box to complete four true equations.
DRAG & DROP THE ANSWER
A. c
B. −c
C. −b
D. −a
E. a
F. b
(image below)

Answers

Answer:

1. -A * -B = C

2. A * -B = -C

3. -C -:- -B = A

4. -C -:- B = -A

Step-by-step explanation:

Here ya go, hope this helps!

Mentally confused, please help.

Answers

If you are looking for the surface area of the cube, it is 169. The equation for the surface area of a square is base times height. This would mean it’s 13x13 since all the sides are the same. 13x13=169

the surface area would be 169 (13x13)

PLS PLS PLS HELP help !!!

Answers

i don’t know what 3 and 4 is but
5. -34
6. 8
7. -9/11

Which equation is modeled by the data in the table?

Answers

Answer:

Step-by-step explanation:

In order to get to the correct answer here, you should plug in each of the x-values from the table into all four equations presented in the answer choices to see which one equals all of the y-values.

When you do this and plug each x-value from the table into the answer choices, option C leads you to getting all of the correct y-values.

So the correct answer choice here is option C, y=5x+3

Answer:

the equation modeled by data table is

y = 5x + 3

The table shows the multiplication of two linear expressions. Select the correct reason for each step.

Reason 1:

Reason 2:

Reason 3:

Reason 4:

Answers

Answer:

Step-by-step explanation:

reason 1:

opening of brackets to solve the expression

reason 2:

in multiplication order is followed i.e. the number always lead the variable in the expression

reason 3:

for clarification brackets are added to multiply like terms i.e. numbers with numbers and variable with the variable

reason 4:

the solved and simplified expression is delivered as a result

The only way to do it is if you are in the t

how to divide 3 ÷ 0.4 =

Answers

Answer:

7.5

Step-by-step explanation:

I think the answer is 7.5 I haven’t done this math in a while but I think that answer makes sense

Divide: 5 and 2/3 divided by 3/2

Answers

Answer:

3.77777777778

Step-by-step explanation:

3.8 (rounded)

The answer is 3.8
Hope I helped:3

0.40x +120 < 327

i'm so confused with this

Answers

Answer: all this needs is an explanation

Step-by-step explanation: 0.40x we don't know x and there is not enough info to find it. first 327-120=207 so basically x cannot surpass 517.5

the right answer would be 517.4 or less because it mustn't surpass 207 or be equivalent to it. hope this helps

517.5 for x? 517.5 is x but I don’t know what to find.

Simplify the expression
(2b + 3r) + (4b + r)

Answers

The simplified expression is 6b+4r

Help me please il give 20 points!

Answers

Answer: 1. a. 15 b. 11 c. 2 d. 7 e. 5.5

2. Stem: Leaf:

1 9

2 5, 9

3 3, 3, 8

4 0, 7, 9

5 4, 5

6 1, 5

7 2, 7

8 1

3. a. 13 inches b. I'm pretty sure that it is the second quarter because there is more snow. c. The first quarter because it's section is more spread out among the numbers.

Step-by-step explanation:

Answer: 1. a. 15 b. 11 c. 2 d.7 e. 5.5
2. Stem:
Leaf:
9
2
5, 9
3
3, 3, 8
4
0, 7, 9
5
4, 5
6
1,5
7
2, 7
8
1
3. a. 13 inches
b. I'm pretty sure that it is
the second quarter because there is more show.
c. The first quarter because it's
section is more spread out among the numbers.
Step-by-step explanation:

If a person earned $32,000 a year and received $800 raise, what was the percent increase in her salary?

Answers

Answer:

Hey there!

This would be a 2.5% increase in salary.

Using the percent increase formula we find the answer to be a 2.5% increase.

Let me know if this helps :)

Answer:

2.5%

Step-by-step explanation:

((new - original) / original) * 100

328-320 = 8/320 = 0.025

0.025 * 100 = 2.5

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