Kalon and his friend Marna own a chimney sweep service company. Working together, they can clean a 20-foot chimney in 1Five-sevenths hours. If it takes Kalon 4 hours to clean a 20-foot chimney by himself, how long does it take Marna to clean the same size chimney by herself?
Answers
20
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.
won't that be plagrisim thought?
step-by-step explanation:
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