You deposit $400 into an account that pays 4.25% interest compounded quarterly. How many years, rounded to the nearest year, will it take for there to be $1600 in
your account?

sorry but i cant draw that

perpendicular to x*4 means it's y = -1/4*x+k

so for y = 7 and x = 2

we have 7 = -1/4*2 + k so k = 7.5

so the equation is   y = -1/4x + 7.5

the answer is b

576 cm2

hope i got it for you : )