40x + 18(x-3) = 468keeps saying it is 6, but i'm getting 9. can someone do it step by step?

Any is very appreciated! (picture is provided below)not sure how to do this at all won't lie

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.

On the day a coffee shop first opened, it had 140 customers. 65% of the customers ordered a large coffee. how many customers ordered a large coffee? enter your answer in the box.