Find the length of side x in simplest radical form with a rational denominator

Will give brainliest summations with algebraic expressions image shown

The verbal translation for the difference of m and 7 increased by 15

Sherrie is baking a pie for her family. she leaves the room and comes back to 35% of the pie having been eaten before she can put the topping on. how much 1 square inch strips of dough will she need for the top, now that a portion is missing? round your answer to the nearest while nimber.