If 250 mg of a radioactive element decays to 180 mg in 24 hours, find the half-life of the element.

What is the percent of increase for a population that changed from 438,000 to 562,000

The length of a rectangle is twelve inches more than its width. The perimeter of the rectangle is 276 inches. What are the dimensions of the rectangle?

Give 3 solutions on 14x+7y=28 that will satisfy the consistent systems

Show your work everywhere you can! solve for x. c. x/5-12=48

Which fraction is equal to 0.137

How many numbers are between k and n?

Timothy tried to solve an equation step by step. 9 (2x+1/3) = 39

Find the inverse of y = 2x^2-8

What is the equation for as amembership fee, a health club charges a one-time amount of $40 and charges $25 for each month. The total fee after m months is $240. What is the value of?

By what number would you multiply - 3/8 (fraction) to get a product of 1?