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krek1111 [17]
3 years ago
10

The radius of this ball is 15 inches. Which equation gives the ball's surface area, in square inches?

Mathematics
2 answers:
lilavasa [31]3 years ago
8 0

Best to look up the formula for the surface area of a sphere and then find it:

A = 4πr^2, where r is the radius of the sphere.  Then,

A = 4π(15 in)^2 = 4(3.14)(225 in^2) =  2826 in^2 (answer)

This is represented by the formula given in the lower left.

Reil [10]3 years ago
3 0

Answer:

225 Square inches

Step-by-step explanation:

Bottom left

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Answer:

≈ 1833

Step-by-step explanation:

To find ratio of proton mass to electron mass, we have to divide.

The numbers are given in <em>scientific notation</em>.

Let a number be  a*10^b and another be  c*10^d, when we divide, we will follow the rule shown below:

\frac{a*10^b}{c*10^d}=(\frac{a}{c}*10^{b-d})

Now, we use the information given to find the ratio:

\frac{1.67*10^{-24}}{9.11*10^{-28}}\\=(\frac{1.67}{9.11}*10^{-24--28})\\=0.1833*10^4

This means we can find the number by taking 4 decimal places to the right, so that would becomes:

0.1833*10^4=1833

The approximate ratio is 1833 [mass of proton is around 1833 times heavier than mass of electron]

7 0
3 years ago
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Ilya [14]

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I think its A

Step-by-step explanation:

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Divided 2) Ellie made $253 for 22 hours of work. She makes $11 per hour so Identify the error:​
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Step-by-step explanation:

253$ / 11$= 23 hours

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