Sergei has a credit card that uses the average daily balance method. for the first 12 days of one of his billing cycles, his balance was $350, and for the last 18 days of the billing cycle, his balance was $520. if his credit card's apr is 14%, which of these expressions could be used to calculate the amount sergei was charged in interest for the billing cycle?

the answer is b: 18

step-by-step explanation:

use the pythagorean theorem to .

a^2+b^2=c^2

plug 18 for "r"

the 2 legs are 18 and 24

18^2+24^2=c^2

324+576=c^2

900=c^2

c=30

30-12=18

18 is the radius

: )

answer: 7 x 2/5 = 2.8 hours, is your answer. your welcome! : 3

step-by-step explanation: first work out how long it took to hose 1/7 of the lawn which is 2/5 hours. times that by 7 to get the whole lawn.

sorry i don't know the other answer. i didn't learn what a proportional relationship is.

noncoplanar points are points that do not lie on the same line.