Which expression represents an unknown number added to 13? a) 13+t b) 13t c) 13-t d) 13/t

Answer

The expression that represents an unknown number added to 13 is a) 13 + t

being t an unknown number.

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:

1,589.63 in.^3

step-by-step explanation:

i hope this you : d