What is the value of X?

The last choice:  x = 3.

Step-by-step explanation:

M < WYX = 1/2 * 78 = 39 degrees ( angle  opposite te arc of 78 degrees).

Therefore m < XWY = 180-114-39 = 27 degrees.

7x + 6 = 27

7x = 21

x = 3.

-10-15= -25

-3+(-5) - positive sign and negative sign = negative sign

-3-5= -8

-5x - 2y² + 1

Use the substitution method

-5(4)-2(-2)^2+1

(-2)(-2)= 4

-20-8+1= -28+1

= -27

Answers :

-10-15= -25

-3+(-5)=-8

-5x - 2y² + 1= -27