What is a expression that contains at least one variable

What is 5Y + (3Z + X)

John drives at an average speed of 40 miles per hour for the first 5 hours of the 655 mile trip to buffalo. Charlie then drives the remaining distance in 7 hours. What is Charlie's average driving speed?

Una resma de papel tiene 20 cm de largo, 15 de ancho y 5 de altura. Calcula el volumen de una de sus hojas.

Each interior angle of a regular polygon is 120 greater than each exterior angle calculate the number of sides

Severe depression is likely to be treated with

Which ordered pair is a solution of the equation y = 4x? (1, 3) (-1, - 4) (-4, - 1) (1, - 4)

A bowl contains 3 red, 8 blue, and 7 black beads. Margaret randomly selects 3 beads one after the other without replacement. Find the probability of getting a red, blue, and black bead, in that order.

Solve for x 7/x+9=21/36

What is the y-intercept of f (x) = 11

Write a sentence that shows the commutative property of multiplication