Express the complex number in trigonometric form. -5i

a. 5(cos 270° + i sin 270°)
b. 5(cos 180° + i sin 180°)
c. 5(cos 90° + i sin 90°)
d. 5(cos 0° + i sin 0°)

Show algebraically that f and g are inverse functions f(x)=x^2/-6; g(x)=square root of 2x+12

Aclassmate thinks that solving a system by graphing gives an exact answer when the lines appear to cross at a grid point, but only an approximate answer when they don't. explain why this isn't true.

What are two numbers that add up to -9 and multiply to -10 best answer gets branliest and 100 extra points