Copy Center charges page for machine -fed copies and 20¢ per page for hand-fed copies. If Logan Kaminski's bill for 80 copies of his movie script is $13.00, how many copies of each type were made?

What is the length of the missing leg in this right triangle? 18 mm 24 mm 26 mm 32 mm

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)

[10 points, algebra 2-simplifying complex fractions]according to my answer key the restrictions are -1 and 4. but why not positive 1?