Question: Let a1, a2, a3,..., an,... be a geometric sequence. In Problems 15-24, find the indicated quantities 16.a1= 32; r = -1/2; a2= ?; a3 =

Let a1, a2, a3,..., an,... be a geometric sequence. In Problems 15-24, find the indicated quantities
16.a1= 32; r = -1/2; a2= ?; a3 = ?; a4 = ?
18.a1= 3; a7 = 2,187; r = 3; S7 = ?
20.a1= 240; r = 1.06; a12 = ?
22.a1 =100; a10 = 300; r = ?
24.a1= 8,000; r = 0.4; S10 = ?; S∞ = ?

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