In 2001, the population of the united states was about 2/7 billion people. it is projected that by 2025, there will be 1/3 billion people in the united states. how much will the population increase by 2025? plse show steps

Apositive number a or the same number a increased by 50% and then decreased by 50% of the result?

Rob spent 25%, percent more time on his research project than he had planned. he spent an extra h hours on the project. which of the following expressions could represent the number of hours rob actually spent on the project? two answers

John used linear combination to solve the system of equations shown. he did so by multiplying the first equation by -3 and the second equation by another number to eliminate the x-terms. what number did jonas multiply the second equation by? 4x-6y=23x+5y=11