Unit 10 Test Review

Which is the recursive formula for arithmetic sequences?

• f(n) = f(n - 1) + d

• f(n) = f(1) + (n-1) * d

• f(n) = f(n - 1) * r

• f(n) = f(1) * r^{n - 1}

Which is the explicit formula for arithmetic sequences?

• f(n) = f(n - 1) + d

• f(n) = f(1) + (n-1) * d

• f(n) = f(n - 1) * r

• f(n) = f(1) * r^{n - 1}

Which is the recursive formula for geometric sequences?

• f(n) = f(n - 1) + d

• f(n) = f(1) + (n-1) * d

• f(n) = f(n - 1) * r

• f(n) = f(1) * r^{n - 1}

Which is the explicit formula for geometric sequences?

• f(n) = f(n - 1) + d

• f(n) = f(1) + (n-1) * d

• f(n) = f(n - 1) * r

• f(n) = f(1) * r^{n - 1}

What are the next 4 terms of the arithmetic sequence 40,30,20,... ?

• 10,0,-10,-20

• 10,5,2.5,1.25

• 30,40,50,60

• 10,-10,-20,-30

What are the next 4 terms of the arithmetic sequence -16,-9,-2,... ?

• 5,12,19,26

• 4,11,18,15

• 6,13,20,27

• -1.125,-0.6318125,-0.3560,-0.2002

Find the 15th term in the arithmetic sequence -11,-8,-5,-2,...

• 28

• 31

• 34

• -52612659

Find the 17th term in the arithmetic sequence 107,99,91,83,...

• -13

• -21

• 235

• 75

What are the next 4 terms of the geometric sequence -3,15,-75,... ?

• 375,-1875,9375,-46875

• -375,1875,-9375,46875

• 135,-195,255,-315

• -135,195,-255,315

What are the next 4 terms of the geometric sequence 243,81,27,... ?

• 9,3,1/3,1/9

• 81,243,729,2187

• 27,9,3,1/3

• 3,1/3,1/9,1/27