In an online media store, download songs cost $3 each and books cost $9 each. taslimah paid $7 in sales tax when she purchased 15 songs and 3 books. find how much taslimah spent in total, including sales tax.

songs cost $3 each

15 songs cost 15 * $3 = $45

books cost $9 each

3 books cost 3 * $9 = $27

Taslimah paid $7 in sales tax

Add the cost of the songs, the books and the sales tax to find the total.

total = $45 + $27 + $7 = $79

$79

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.