TJ invested $8000 in a bond at a yearly rate of 4% simple interest. He earned $1120
in interest. How long was the money invested?

3.5 years (3 years 6 months)

Step-by-step explanation:

You are going to use the simple interest formula for this:

P = initial balance

r = annual interest rate

I = interest

First, change 4% into a decimal:

4% -> -> 0.04

Now, plug in the values into the equation:

The money was invested for 3.5 years (3 years 6 months).

answer: ask

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.