I ned help with this asap. im not well with percentages

A+b= 17, ab=70, find the value of |a-b|

The price for gasoline is represented by the equation y=3.69x, where y represents the total price for x gallons of gasoline. on a graph, the number of gallons is represented on the horizontal axis, and the total price is represented on the vertical axis. determine whether each statement describes the graph of the equation. select true or false for each statement

Arectangular yard has area 96 square feet. if the width of the yard is 4 feet less than the length