Use this diagram to find the value of questions 11-15 PLS PLSPLS HELP I WILL MARK FIRST ANSWER AS BRANLIEST

2.5 milligrams is equivalent to how many grams

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

The table below shows the approximate height of an object x seconds after the object was dropped. the function h(x)= -16x^2 +100 models the data in the table. for which value of x would this model make it the least sense to use? a. -2.75 b. 0.25 c. 1.75 d. 2.25