Please solve with explanation 30 points

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

Abacteria population is tripling every hour. by what factor does the population change in 1/2 hour? select all that apply

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.