The radius of the sphere is 9 inches. Which equation can be used to find the surface area of the sphere? A sphere with a radius of 9 inches S = 4 pi r squared = 4 (9) squared S = 4 pi r squared = 4 pi (9) squared S = 4 pi r squared = 4 pi (18) squared S = 4 pi r squared = 4 pi (9) squared + 2 pi (9)

step-by-step explanation:

the original amount doesn't ''re just looking for the time it takes for 1/2 of the substance to we have

(1/2) =)     take the ln   of both sides

ln (1/2)   = )   and we can write

ln(1/2) = ) lne     and lne   = 1     so we have

ln(1/2) = -.1092t     divide both sides by -.1092

t = ln(1/2)/-.1092 = about 6.347 days = about 6.3 days (rounded)

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