Find the value of x that makes m || n .

Step-by-step explanation:

If the lines m and n are parallel, then the 2 inside angles that make a "C" shape are co-interior angles. These are supplementary or add up to 180 degrees.

Therefore, for m and n to be parallel, then x and 2x must add up to 180 degrees.

Solve for x. First, combine like terms on the left side of the equation. Add x and 2x.

Solve for x by isolating the variable. It is being multiplied by 3. The inverse operation of multiplication is division. Divide both sides of the equation by 3.

The value of x that makes m parallel to n is 60.

341

step-by-step explanation:

all you have to do is 9x31 (which equals 279) and then 20x31 (which equals 620). then you have to subtract. 620-279=341.