In the diagram below, DE is parallel to XY. What is the value of x?

the value of x is

115°+y=180 (being linear pair)

y =180°-115°

therefore, the value of y is 65°.

now again x=y=65°(being corresponding angle)

so, the value of x is 65°.

hope u understood..

f(x) has value 150 at x= 0

and 0 at x= 3

so d(f(x))/dt = slope = -150/3 = -50