Question 99
base = height+5
The area is {{{  (base*height)/2  }}}, so, base*height/2 = 75

since base = height + 5

(height+5)*height/2 = 75

(height+5)*height = 150
{{{height^2 +5*height = 150}}}
{{{height^2 +5*height - 150 = 0}}}

This is a quadratic equation, solve it using my solver.

I am including its graph: {{{ graph( 300, 300, -18, 12, -200, 200, x^2+5x-150) }}}

Looks like the only positive root is x=10.