If 4 apples cost 0.80, how much do 12 apples cost

Rewrite the equation in the form y = k/x xy = - 45 x = 15/y 2xy=9 what are the answers and how do i solve them?

Solve for x - x+1.75=7.14

The measure of an obtuse angle is given as (3x-42). What inequality describes all the possible values if x for the angel

Write 0.126126126 ... as a fraction

Max observes the zoo and the library from a helicopter flying at a height of 200 times square root of 3 feet above the ground, as shown below: A helicopter is flying at a height of 200 multiplied by square root of 3 feet above the ground.

3 (6x^2-5x+7) - 2 (-4x^2+8-10)

A model ship is built to a scale of 1 centimeter: 5 meters

Simply: x^3 y^3 / x^3 y^2 (the arrows mean to the power of the number)

A costumer is buying 3dvds that cost $6.55 each, with an additional 8% sales tax. What is the total amount that the costumer pays, rounded up to the nearest cent

One of Edna's grandchildren, Toby, plans to spend 4 years in college. The university awards him a scholarship to cover his tuition, but he will need an additional $8,000 for other expenses over the four years.