What is the value of 5k2 - 6 when k = 9?

Given: △ABC is a right triangle There are 3 shaded squares with sides a, b, and c, respectively. a, b, and c are also the lengths of the sides of the right triangle, such that the area of the square with side a is a2 and the area of the square with

Morgan is walking her dog on an 8-meter-long leash. She is currently 500 meters from her house, so the maximum and minimum distances that the dog may be from the house can be found using the equation |x - 500| = 8.

Fifty liters of a 40% acid solution is obtained by mixing a 25% solution with a 50% solution. (a) Write a system of equations in which one equation represents the amount of final mixture required and the other represents the percent of acid in the

How many times longer is the diameter of a grain of sand than the diameter of the average cell in the human body? Show your work.

What is expanded form for 4,408,730?

A car dealer paid a certain a price for a car and marked it up by 7/5 of the price. Later, he sold it for$24.000. What is the original price.

Let's say Reena and Greg each work for 20 minutes making envelopes. Who will have more envelopes to sell in the flea market? What if they end up working longer? Will the outcome change?

Whats the greatest ten you can multiply by 19 to get close to but not go over 684

How many solutions does 5x-9=-9+5x have? (show your work)

A Girl Scout had 5x-12 boxes of cookies and sells 3x+18 of them. Write an expression to represent the amount of boxes she has left.