Answer:
x-y
Step-by-step explanation:
when you subtract (-2x-8y)-(-3x-7y)
you have to distribute that negative onto -3x-7y which turns it positive
which results in -2x-8y+3x+7y
simplified to x-y
Its different for different people but for me it was easy.
You have to divide 10 by


÷

⇒

x

You use a method called "flip-flop and multiply" where you flip the second fraction to multiply

×

⇒

Now divide the numerator (top) by the denominator (bottom)

÷

Now lets check:


÷
Answer: 
×
Answer:
b
Step-by-step explanation:
yp
Every triangle has an angle measure of 180 degrees.
so 42+20+x (where x is the measure of the third angle)=180
Combine like terms.
62+x=180
Subtract 62 from both sides
x=118.