Which choices are equivalent to the expression below? check all that apply sqrt(-9)

a. -3
b. 3i
c. i sqrt 9
d. - sqrt 8

The ratio of the measures of the three angles in a triangle is 2: 9: 4. find the measures of the angels

Suppose y varies directly with x. write a direct variation equation that relates x and y. then find the value of y when x=12 y=7 when x=3

An 18% discount on a watch saved a shopper $72. find the price of the watch before the discount