Evaluate f(x) = 4/5x - 6 for f(20)

f(20) = -149/25

Step-by-step explanation:

f(x) = 4/5x - 6, f(20)

f(20) = 4/5(20) - 6

= 1/5 × 5 - 6

= 1/25 - 6

= 1 - 25 × 6/25

= 1 - 150/25

f(20) = -149/25

c

step-by-step explanation:

at least i think its

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: