Can you help me with answer please

If eh = hg and hg=16, find the diameter of k

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.

Suppose that the price p, in dollars, and the number of sales, x, of a certain item follow the equation 4 p plus 4 x plus 2 pxequals56. suppose also that p and x are both functions of time, measured in days. find the rate at which x is changing when xequals2, pequals6, and startfraction dp over dt endfraction equals1.5.