If 0 y, find y = cos-1(-1) Express the answer in radians y = 2pi k
y = pi
y = 2 pi

-1, -2, -3, -4, -6

step-by-step explanation:

c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.

i have not got your picture clearly so see it once again