Solve the formula for the indicated letter.
Mathematics
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Find a polar equation for the circle.x2 + (y - 9)2 = 81
A. r = 18 cos ? B. r = -18 sin ? C. r cos ? = -18 D. r = 18 sin ?
Mathematics
Find the limit of the sequence or determine that the limit does not exist.an = 
A. 1 B. does not exist C. ln 8 D. 0
Mathematics
Multiply.(5x2 - 4)(x6 - 3)
A. 5x12 - 4x6 + 15x2 - 12 B. 5x12 - 4x6 - 15x2 - 12 C. 5x8 - 4x6 - 15x2 + 12 D. 15x8 - 4x6 - 15x2 + 12
Mathematics
Solve the problem.A balloon (in the shape of a sphere) is being inflated. The radius is increasing at a rate of 14 cm per second. Find a function, r(t), for the radius in terms of t. Find a function, V(r), for the volume of the balloon in terms of r. Find (V ? r)(t).
A. (V ? r)(t) = 
B. (V ? r)(t) = 
C. (V ? r)(t) = 
D. (V ? r)(t) = 
Mathematics