What is the frequency of a wave of red light that has a wavelength of 675 nm (6.75 x 10 m) and a speed of 281 m/s?

Write numerical coefficient of y² in the expression 2x² - 15xy – 7y²

The boiling point of water at an elevation of 0 feet is 212 degrees fahrenheit (°f). for every 1,000 feet of increase in elevation, the boiling point of water decreases by about 2°f. which of the following represents this relationship if b is the boiling point of water at an elevation of e thousand feet? a) e = 2b - 212 b) b = 2e - 212 c) e = -2b + 212 d) b = -2e + 212

Mackenzie needs to determine whether the rectangles are proportional. which process could she use? check all that apply.