David rides his bike 4 miles in 15 minutes. what is his average speed in miles per hour

If f(x)=3x+1 and f^-1=x-1/3, then f^-1(7)=

Amovie streaming service charges it’s customers $15 a month. martina has $98 saved up. will she have any money left over if she pays for the maximum amount of months she can afford? explain.

Three numbers x, y, and z are in the ratio 2: 7: 8. if 12 is subtracted from y, then three numbers form a geometric sequence (in the order x, y–12, z). find x, y, and z. there are 2 sets.