The algebraic expression
(3x2 - 4x + 7) - 2(1 - 2x + x2)
in standard form will be a binomial
ax2 + c.

Step-by-step explanation:

a=1,c=5

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:

b. 153 students do not participate in sports and seventy-five 12th graders were surveyed