I have to solve for x

x = 12

Step-by-step explanation:

140 + x = 180

-140        -140

x = 40

A triangle sums up to 180 degrees so add all of the sides

40 + (3x + 4) + (8x + 4) = 180

Add all like terms

48 + 11x = 180

-48           -48

11x = 132

Divide

x = 12

this may not be at all, but i use the same website you're using for school, and if i'm stuck doing one of these i try to look for it on the section.

45.36 feet per second

step-by-step explanation:

tyrone travels 30 miles in 58.2 minutes.  

1 mile = 5280 feet; this means he travels

30(5280) = 158400 feet in 58.2 minutes.

1 minute = 60 seconds; this means he travels 158400 feet in

58.2(60) = 3492 seconds.

this gives us the unit rate of

158400/3492 = 45.36 feet per second.