What is the sum of the polynomials? (8x^2-9y^2-4x)+(x^2-3y^2-7x)

Step-by-step explanation:

The given equation is as follows.

Both the equations can be added with coefficients of same variables. Coefficients with different variables cannot be added together.

Therefore, place the same variables together as follows.

 =  

Adding the respective variables, we will get the following.

  =

Thus, we can conclude that sum of is .

50x5=$250

step-by-step explanation:

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.