Betty currently has $2000

Interest rate increases by 100%+n%

n% = 1.5%

100%+1.5%=101.5%=1+0.015=1.015^x

so its y = 2000(1.015)^x

c is the correct answer

step-by-step explanation:

it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so: