Mrs. johnson is buying every student in her math class a pencil and an eraser. each pencil costs 25 cents and each eraser costs 15 cents. if x represents the number of students in mrs. johnson’s class, what is the equation for this

Total amount spent by Mrs. Johnson :  T(x) = 25x + 15x

Step-by-step explanation:

Cost of each pencil =  25 cents

Cost of each eraser = 15 cents

x is the number of students in the class.

So, total cost of erasers purchased= 15x

and total cost of pencils purchased = 25x

Hence, Mrs, Johnson Spends total amount on eraser and pencil = 25x + 15x

or, total amount spent by Mrs. Johnson:  T(x) = 25x + 15x

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: