19. Which transformation reflects a figure across the y-axis? A (X. y) (-x, y)
B (x. y) - (-X. -Y)
C (x, y) - (-Y. x)
D (x. y) - (y, -x)

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)

The sum of these consecutive integers is equal to 9 less than 4 times the least of the integer. find the three integers

700 miles the train takes 5 hours to a travel the distance at what unit rate is the train traveling?