The graph at left in the tc-plane models the global wind power capacity, c, in gigawatts, t years since 1996. What is the best interpretation of the c-intercept of this graph?

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  c(0) = 7 means global wind power capacity was 7 GW in 1996

Step-by-step explanation:

The c-intercept is the global wind power capacity at t=0, which was in 1996. The scale is in gigawatts, so c=7 at t=0 means ...

  global wind power capacity was 7 GW in 1996

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.