Help me I need the answer

x = 20

Step-by-step explanation:

Angles that form a line are supplementary angles

supplementary angles add up to equal 180°

Thus, 4x + 40 + 3x = 180

                       ^ (Note that we just created an equation that we can use to    

                          to solve for x )

Now its just basic algebra

4x + 40 + 3x = 180  

step 1 combine like terms

3x + 4x = 7x

we now have 7x + 40 = 180

step 2 subtract 40 from each side

40 - 40 cancels out

180 - 40 = 140

now we have 140 = 7x

step 3 divide each side by 7

7x / 7 = x

140 / 7 = 20

we're left with x = 20

20 is the correct answer

Step-by-step explanation:

3x + 4x + 40 = 180

7x + 40 = 180

7x + (40 - 40) = 180 -40

7x = 140

7x/7 = 140/7

x = 20

if you are looking for the unit rate then the answer would be 9 because unit rate is distance divided by time.

step-by-step explanation: