How to use mental strategy to add and subtract

What is the value of the rational expression below when x is equal to 4? 12 + x 4+x

maria bought seven boxes. a week later half of all her boxes were destroyed in a fire. there are now only 22 boxes left. with how many did she start? show work

Which of the following expression are equivalent to - 3.5 (2 - 3m) - 2.5n?

mr. Vasquez determines that the area of a bathroom is in his house is 25 square feet less than one-fifth of the area of the living room if the bathroom measures 35 square feet what is the area of the living room

Bill plans to buy a movie ticket for himself and three of his friends. The cost of a ticket is $5.75. How much will he spend on tickets

What does seven plus seven equal

The amount of a sample remaining after t days is given by the equation P (1) - Al2where A is the initial amount of the sample and h is the half-life, in days, of the substance. A sample contains 60% of its original amount of Fermium- 257.

What order will result a final output of 131,065 when the first input is 64

The three incoming currents at a node in an electrical current measure. 7 amps,.68amps,.47 amps. two of the three outgoing currents measure. 8 amps and. 55 amps. find the measure of the third outgoing current

Your school raised 125% of it's fundraising goal. The school raised $6750 what was the goal?