The formula to find the surface area of a sphere is to take the radius of the sphere and square it and multiply that amount by pi and then multiply that by 4. This is written algebraically as S=4πr2, where S is the surface area, r is the radius, and the value of π is 3.14. Rewrite the equation to solve for the radius of the sphere if you know the sphere’s surface area. Then estimate the radius of a sphere given a surface area of 500 meters2.

Question

anonymous · Answer

I need to understand how to use combining like terms for this problem

anonymous · Answer

i understand that you need to add each number to each side

anonymous · Answer

but i don't know the correct order
i know the set up, just not the right number places

anonymous · Answer

S=4πr^2   
divide everything by 4π 
S 4π  =r^2  
take the positive square root of both sides, (we are working with length so negative does not make sense)
so
S 4π   − −  √ =r 
now let S=500