Question

FIRST CHECKING ACCOUNT I did 7 * 12 (monthly) * 0.20 = 16.8
2ND CHECKING ACCOUNT
8 * 12 (Monthly) * 0.15 = 14.4
is it C ?
check out in comment box

Answer 1

solve the equation

0.2x + 7 = 0.15x + 8

the result for x is the number of checks that will make both options equal in cost

to get the min cost that will make the second option cheaper, you just add 1 to the result you got for x

Answer 2

i meant min amount of checks, but you get the idea (hopefully)

Answer 3

tell me what you get

Answer 4

i got 7.2 after i added 0.2 + 7
0.15 + 8 = 8.15
7.2 + 8.15 = 15.35

Answer 5

you don't add 0.2 and 7 because 0.2x and 7 aren't like terms

Answer 6

0.2x + 7 = 0.15x + 8

0.2x = 0.15x + 8 - 7

0.2x - 0.15x = 8 - 7

0.05x = 1

x = ??

Answer 7

its d! i rounded it off

Answer 8

when you solve for x, you get x = 20

add 1 to get 21

so D is your answer, nice work