In triangle ABC, angle C is a right angle. Find the value of the trig function sec A if c = 25, b = 20, a = 15. (Hint: draw a triangle and label with given information)

If y varies directly as x2 and y=6 when x=6, find the constant of variation.

Complete the equation of the live through (-1,6) (7,-2)

Suppose a laboratory has a 30 g sample of polonium-210. the half-life of polonium-210 is about 138 days how many half-lives of polonium-210 occur in 1104 days? how much polonium is in the sample 1104 days later? 9; 0.06 g 8; 0.12 g 8; 2,070 g