If f(x) = 2x, then f '(x) =
- 2x
x
X-2

Step-by-step explanation:

if f(x)=2x then f’(x)=dy/dx=2

Oddly that is not one of the choices shown, but the constant 2 is the derivative of 2x.

second option

step-by-step explanation:

the measures of a triangle equal 180. use that to find x.

2x+3x+4x=180

9x=180

9x/9=180/9

x=20

now you know x, you know angle a is 40°, angle b is 60°, angle c is 80°.

because angle a is 40°, the first option doesn't work.

because angle b is 60°, the second option does work.

when you add angle a and b, you get 100°. complementary means it equals 90°, so the third option doesn't work.

when you add angle a and c, you get 120°, which is not 100.