What is the best estimate for this object?

Donald has x twenty-dollar bills and 11 ten-dollar bill. how much money does donald have? write your answer as an expression.

Find the slope of the line that passes through the points (-3, -1) and (0, 3). 3/4 0 4/3

The length pf a rectangle is given by 2t +3 and its height is square root t, where t is time in seconds and the dimensions are in centimeters. find the rate of the change of the area with respect to time. a'(t)=