Element X is a radioactive isotope such that every 42 years, its mass decreases by half. Given that the initial mass of a sample of Element X is 50 grams, how long would it be until the mass of the sample reached 45 grams, to the nearest tenth of a year?

How many square feet of out door carpet will we need for this hole? 8ft 3ft 12ft 4ft

Girardo is using the model below to solve the equation . girardo uses the following steps: step 1 add 4 negative x-tiles to both sides step 2 add 1 negative unit tile to both sides step 3 the solution is which step could be adjusted so that gerardo's final step results in a positive x-value? in step 1, he should have added 4 positive x-tiles to both sides. in step 1, he should have added 3 negative x-tiles to both sides. in step 2, he should have added 4 negative unit tiles to both sides. in step 2, he should have added 1 positive unit tile to both sides.

An alternative to car buying is to make monthly payments for a period of time, and then return the vehicle to the dealer, or purchase it. this is called