URGENT NEED HELP GIVING AND EXTRA PTS GIVE EVIDENCE NO LINKS OR FAKE ANSWERS OR I THINK AS THAT ALLOWS YOU TO SCAM PTS IF YOU DO U WILL BE REPORTED

Suppose that the price p (in dollars) and the weekly sales x (in thousands of units) of a certain commodity satisfy the demand equation 4p cubedplusx squaredequals38 comma 400. determine the rate at which sales are changing at a time when xequals80, pequals20, and the price is falling at the rate of $.20 per week.

Solve 3x-18=2y and 5x-6y=6 by elimination show work

Find two numbers if their sum is 91 and the ratio is 6: 7?