MATHEMATICS MIDDLE SCHOOL

A new pencil was 18 cm long. Now it measures 12.7 cm. How many centimeters of the pencil have been used?

Answers

Answer 1
Answer:

Answer- 5.3 cm

Step-by-step explanation:

18-12.7
Answer 2
Answer:

18-12.7, 5.3 centimeters have been used

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how to find the depth of a rectangular prism?? I already have the length, width ad the volume. But I'm confused on how to find the height?

Answers

You have everything you need to find it.
Look at this for a second:

Volume = (length) x (width) x (height)

Divide each side of this equation by (length) x (width), and you have

Height = (Volume) / (length x width)

You have all the numbers on the right side, so you can easily find the height.


set up your equation

Length x Width x Height = Volume

plug in the known factors and simplify L x W x H. Divided the numerical value on both sides. you are left with H

What is the missing number in the data set 15,17,28,30 if the mean is 23

Answers

mean is add the numbers and divide the result by how many numbers there are
mean=23
1 missing number which is x
5 numbers including missing one 
(15+17+28+30+x)/5=23
solve for x
multiply both sides by 5
15+17+28+30+x=115
add like terms
90+x=115
subtract 90
x=25

the missing number is 25
15+17+28+30=90, if theres another number than there r 5 total numbers, 23*5=115, 115-90=25, so 25

A triathlon event consists of 2.4 miles of swimming, 112 miles of biking, and 26.2 miles of running. How far does a person travel in completing 4 triathlons?

Answers

A person would travel 562.4 miles.

1/5(2x-15) + 3/5x = 4 1/4

x=?

Answers

1/5(2x-15) + (3/5)x = 4 1/4
x*2/5 - 15/5 + x*3/5 = 4 1/4
x*2/5 - 3 + x*3/5 = 4 1/4
x*(2/5+3/5) - 3 = 4 1/4
x*(5/5) - 3 = 4 1/4
1*x - 3 = 4 1/4
x= 4 1/4 + 3
x= 7 1/4

Herta bought envelopes of flower seeds that each cost the same. She spent a total of 36$. Find three possible cost per envelope and the number of envelopes that she could have purchased.Please help me!

Answers

3 for £12 each12 for £3 each6 for £6 each

Please!!! help, urgent math problem!

Answers

Answer:

The slope is 1


Step-by-step explanation:

To find the slope, we use the formula

m = (y2-y1)/(x2-x1)

where (x1,y1) and (x2,y2) are the points on the line

m = (9-2)/(3--4)

 = (9-2) /(3+4)

 = 7/7

 =1

The slope is 1

Answer:

1

Step-by-step explanation:

Slope = change in y / change in x

Y-values: 9 and 2

x-values: 3 and -4

Change is the difference

9-2)/(3- (-4)) = 7/7 = 1
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