The rope is not long enough a meter is roughly 3 feet 3 inches totalling out to 98 feet and a few inches
B. 12 is the answer to your queation
The triangle can be isosceles or scalene but not equilateral
The line y=7 is a horizontal line with a slope of 0.
Slope intercept form of
y=mx+b
would be
y-y1=m(x-x1)
m=0 and point of (-1,-10)
y-(-10)=0
y=-10