Solve x²=49 by extracting sqaure root

What values of x satisfy the inequality x^2-9x< 0? how is your answer shown on the graph?

Sketch the region enclosed by the given curves. decide whether to integrate with respect to x or y. draw a typical approximating rectangle and label its height and width. y= 5x, y=7x^2then find the area s of the region.

There were 25 students who answered to a survey about sports. four-fifths of them like football. how many students like football?