The ratio of the side lengths of a triangle is 2: 3: 4 the shortest side is 15 inches what is the perimeter

Which expression is equivalent to (9x - 3 1/ + 1 3/8)

What values of c and d make the equation true?

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)