Thirty six of eighty piano keys are black. what fraction of piano keys are black?

What is the value of 1/3x + 7x when x = 5

Create a question with this scenario you could ask that could be answered only by graphing or using logarithm. david estimated he had about 20 fish in his pond. a year later, there were about 1.5 times as many fish. the year after that, the number of fish increased by a factor of 1.5 again. the number of fish is modeled by f(x)=20(1.5)^x.

Secant be and cf intersect at point d inside a what is the measure of cde