The price a hat was $20. It is on sale for $15. What is the percent of change in the price of the hat?

The magnitude, m, of an earthquake is defined to be m=log l/s, where i is the intensity of the earthquake (measured by the amplitude of the seismograph wave) and s is the intensity of a “standard” earthquake, which is barely detectable. what is the magnitude of an earthquake that is 1,000 times more intense than a standard earthquake? use a calculator. round your answer to the nearest tenth.

If f(x) = x+8 and g(x) = 4x- 3, find (f+g)(x)

Which graph has a rate of change of zero