Find the constant of variation k for the direct variation 4x = - y

A textbook store sold a combined total of 440 physics and sociology textbooks in a week. The number of sociology textbooks sold was 54 less than the number of physics textbooks sold. How many textbooks of each type were sold?

An airplane flew 2,400 miles in 4 hours. if the plane flew the same number of miles each hour, how many miles did the plane fly in 1 hour?

What is the width of a rectangle with an area of 300 square feet and a length of? feet? (Connected to last question)

A 10-foot ramp must make an angle of 30° with the ground if it is to reach a certain window. What angle must a 15-foot ramp make with the ground to reach the same window?

Which set of numbers could represent the lengths of sides of a right triangle? A) 7, 9, 11 B) 10, 15, 20 C) 12, 18, 22 D) 8, 15, 17

Which is equivalent to 3x/x+5 - x-5/x A: x^2+25/x (x+5) B: 2x^2+25/x (x+5) C: 2 (x+5) / x (x+5) D: 2 (x-5) / x (x+5)

How do you find a side length of a cube with the surface area of one face (64cm)

The sum of 2 numbers is 17 the difference is 3 what are the two numbers

What is the y intercept of f (x) = 2x^2+8x+6

When would you add in an expression?