The perimeter of a square is increasing at a rate of 5 meters per hour. At a certain instant, the perimeter is 30 meters.
What is the rate of change of the area of the square at that instant (in square meters per hour)?

Sal is tiling his entryway. the floor plan is drawn on a unit grid. each unit length represents 1 foot. tile costs $1.35 per square foot. how much will sal pay to tile his entryway? round your answer to the nearest cent.

Lorenzo ate 2/5 of his bag of almonds. his 4 friends ate equal shares of the remaining bag of almonds?

Twice the sum of a number and 4 is equal to three times the difference of the number and 7. find the number.