1 1/2 x 3/4 pls full aswer

Given f(x) = 17-x^2what is the average rate of change in f(x) over the interval [1, 5]?

If the speed of an electromagnetic wave is 100,000 cm/s and its wavelength is 100 cm, what is its frequency? a) 100,000 cycles per second (hz) b) 1 × 10-3 cycles per second (hz) c) 10,000,000 cycles per second (hz) d) 1,000 cycles per second (hz)

If you have 12 feet of string and you cut it into equal length of 5 inches each how much string will be left