Unit 3 Practice

Create the formula for the geometric sequence:
-4, -16, -64, -256...

• a_n = -4(4)^n-1
• a_n = -4(-4)^n-1
• a_n = 4(4)^n-1
• a_n = 4(4)^n-1

What is a₅ in the sequence defined as follows?
a_n = 5 ⋅ 2^(n-1) 

• a₅ = 160
• a₅ = 40
• a₅ = 10
• a₅ = 80

What is the term position of 31,250 in the following geometric sequence?

2, 10, 50,...

• a₅

• a4

• a₂₀

• a₇

The second and Fifth terms of a geometric series are 750 and -6 respectively , find the first term (a₁)?

• 3750

• -3750

• 2750

• -2750

After knee surgery, your trainer tells you to return to your jogging program slowly. He suggests jogging for 12 minutes each day for the first week. Each week thereafter, he suggests that you increase that time by 6 minutes per day. How many weeks will it be before you are up to jogging 60 minutes per day?

• 8 weeks

• 9 weeks

• 10 weeks

• 11 weeks

Select each of the equations that represent the sequence

8,14,20,26,32,28....

• -3, -1, 1, 3, 5 ,7....

• 3, 5, 7, 9, 11, 13.....

• 4, -1, -6, -11, -16....

• 4, 3, 1, -3, -11....

• 4, 3, 2, 1, 0, -1.....

Given geometric sequence with u₁= 1000 and r = 1/3. At what term in the sequence does the value equal 0.00188?

• n =12

• n=13

• n=5

• n =6