8. What is the first term of the geometric sequence whose 4th term is -3 and sixth term is ?
A. -27
B. -81
C.
D.
C. -1
-1
81
27
9. Find the sum of the first seven terms of a geometric sequence 3, 6, 12
A. 189
B. 281
C. 381
D. 389
3
3
1
-
+
-
1
10. Find the sum of the infinite geometric sequence
A.
B.
1
C.
1
16
32
3
+
64
1
8
2
3
4
11. If the sum of the first seven terms of a geometric sequence is 547 and the
common ratio is -3. Find the first of this sequence.
A. 1
B. 2
C. 3
D. 4
12. The first ticket drawn in a cake raffle will pay the buyer P10. Each succeeding
ticket will pay 3 times as much as the preceding one. What is the total amount
paid of the first ten cake raffle ticket?
A. 595,230
B. 590,490 C. 595,250 D. 595,258
2

n

step-by-step explanation:

answer: c, the green line

step-by-step explanation:

there is no black line, eliminate b.

simple interest implies periodic payments, but the red line shows no payments, eliminate d.

simple interest has equal payments. if paid say every day, the graph is about a straight line (actually a stairstep).

the yellow line is not straight, eliminate a.

check: the green line is straight, answer is c.

simple interest with positive interest rate gives a straight line sloping up to the right. green line:

g(t) = $100 + ($200-$100) ÷ (20 years) × (t years)

= $100 + (4%/year) × ($100)(t years)

incidentally, the yellow line curving upward represents continuously compounded interest

y = $100 × 2^(t years / (14 assuming the yellow line hits $200 at 14 years. 2^0 is 1, so y(0) = $100; 2^(14/14) is 2, so y(14) = $200.