Evaluate the integral by making the given substitution. (use c for the constant of integration.) sec2(1/x7) x8 dx, u = 1/x7

The circumference of a circle is 5 pi cm. what is the area of the circle?

Can someone answer it, and plot it, for 20 points and brainliest answer? p.s. they're the same ! : )

Elena and her husband marc both drive to work. elena's car has a current mileage (total distance driven) of 15,000 and she drives 23,000 miles more each year. marc's car has a current mileage of 46,000 and he drives 9,000 miles more each year. will the mileages for the two cars ever be equal? explain.