Answer:
100
Step-by-step explanation:
100 is the correct answer
10 - 5 = 5
Hope this helped your husband.
648.566 Km is the answer. :)
First find the equation of y.

Find the slope m.
.
Pick one point, I'll pick (-3, 9). Insert coordinates in equation then compute n.
.
The equation of a line y is:
.
The perpendicular line
is same like the normal line except its slope m becomes:
.
The equation of a perpendicular bisector is thus:
.
Hope this helps.