The value of y varies directly as x and y is 9 when x is -3 what constant of variation k?

For f(x)=2x+3 and g(x)=x^2- 8 find (f+g) (x)

Name each raycalculation tip: in ray "ab", a is the endpoint of the ray.

The circumference of a redwood tree trunk is 20π ft, and it is 100 ft tall. what is the approximate volume of the redwood tree trunk? 1,000π ft3 10,000π ft3 4,000π ft3 40,000π ft3