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3 years ago

7-(-12)=7+(-12)=-5 describe and correct the error in finding the difference 7-(-12)

Mathematics

2 answers:

Eddi Din [679]3 years ago

7 0

Answer:

7-(-12)= 19

Step-by-step explanation:

7-(-12)changes to 7+(12) with the rule of Same Change Change or SCC.

And 7+12 is 19.

valina [46]3 years ago

3 0

Answer:

7 - (-12) = 7 + 12 = 19

Step-by-step explanation:

- (-12) is a double negative which means that the minus signs cancel out causing it to to be a positive 12

5 is not the answer because 7 + 12 is 19

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Item 16 A sphere has a radius of 8 centimeters. A second sphere has a radius of 2 centimeters. What is the difference of the vol

Zigmanuir [339]

Answer:

$672\pi \text{ cm}^3$ .

Step-by-step explanation:

We have been given that a sphere has a radius of 8 centimeters. A second sphere has a radius of 2 centimeters. We are asked to find the difference of the volumes of the spheres.

We will use volume formula of sphere to solve our given problem.

$\text{Volume of sphere}=\frac{4}{3}\pi r^3$ , where r is radius of sphere.

The difference of volumes would be volume of larger sphere minus volume of smaller sphere.

$\text{Difference of volumes}=\frac{4}{3}\pi(\text{8 cm})^3-\frac{4}{3}\pi(\text{2 cm})^3$

$\text{Difference of volumes}=\frac{4}{3}\pi(512)\text{ cm}^3-\frac{4}{3}\pi(8)\text{ cm}^3$

$\text{Difference of volumes}=\frac{4}{3}\pi(512-8)\text{ cm}^3$

$\text{Difference of volumes}=4\pi(168)\text{ cm}^3$

$\text{Difference of volumes}=672\pi\text{ cm}^3$

Therefore, the difference between volumes of the spheres is $672\pi \text{ cm}^3$ .

3 0

3 years ago

How many students in the marching band are girls

Hoochie [10]

Answer:

Hello,

If 7/10 boys represent 28 boys so, 3/10 girls ? how many girls ?

cross product

7/10 > 28

3/10 > ?

3/10*28/(7/10)=12

There are 12 girls

Step-by-step explanation:

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3 years ago

Each leg of the race from part a is the same distance. Calculate the team's

SVETLANKA909090 [29]

Answer:

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Step-by-step explanation:

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2 years ago

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A farmer owns about 960 acres of land. If his farm is square, what would be the length of each side in miles, to the nearest ten

OLEGan [10]

It is given in the question that

A farmer owns about 960 acres of land. If his farm is square.

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$1 acre=0.0015625 mi^2$

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Let the side length of the square be x miles .

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$Area=side^2
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\\
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2 years ago

Can someone help please Stickers are sold in packages of 15 sheets. If there are 20 students in the class, how many packages of

MrRa [10]

Answer:

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Step-by-step explanation:

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