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**Unformatted text preview: **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=4πr 2 , 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 . a. solve for r, so divide both sides by 4pie ( S=4pier 2 ) b. square both sides (S/4pie= r 2 ) c. plug in your surface area for S (sqrt(S/4pie)= r ) d. sqrt(500m 2 /4pie) = r e. r = 6.3 meters 4. My brother and I went spur shopping for our upcoming rodeo . We bought a couple of spurs and spur straps. The spurs were $4.50 and the straps were $2.50. I bought twice more straps then spurs and spent $19.00. How many spurs came in a set and how many straps did we buy? a. s = spurs t = straps b. 4.5*s+2.5*t = 19 c. 4.5s+t = 19 d. 9.5 e. s = 19...

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