How do I put y=90-15x in standard form

How do you work this problem (21:7) * 4= is this correct? 3*4=12

Lainey rides a ski lift down the mountain. Her elevation change is - 3,430 feet at a rate of - 490 feet per minute. How long will it take Lainey to travel from the top of the ski lift to the bottom of the ski lift?

Which of the following could be the measure of one of the angles of a right triangle? a) 89 b) 91 c) 93 d) 95

Our principal spent 18422$ on laptops and tablets for the school. if the laptops cost $12,539, how much did the tablets cost?

You are selling tickets for a high school basketball game. student tickets cost $3 and general admission cost $5. you sell 350 tickets and collect $1450. how many of each type of ticket did you sell

A+b=s+r for s I have no idea how to solve this

What is the degree of a polynomial that has roots of - 2, 4i and - 4i?

What is the x value in the solution to the system of linear equations 2x - y = 11 and x + 3y = - 5

How do you find the tangent of a circle?

Greatest common factor of 15 and 30 and 45