The x-intercept is when y=0, so we plug that in our equation,
. +12 on both sides to get
. Divide by -8 to get
320-70= 250
250X1/2=125
X=125
The answer for #8 is C.
7.1 x 7.1 = 50.41
For 10 I can't help you with because there are no answer choices shown on the photo. I would wait for another to help.
A.) 11/12ft x 3/4ft = 11/16 ft(squared)
B.) (11/12ft - 1/6ft) x 3/4ft = 9/12ft x 3/4ft = 9/16 ft(squared)