Answer:
10
Step-by-step explanation:
1/2 (Base x height) = area
1/2 (4*x)=10
2x=10
X=5
The height is 5 units
Eight tenths minus five tenths equals three tenths.
First, we are going to rewrite it as a parabola equation.
Rewrite.

Divide by 8.

Factor out coefficient.

Then, we are going to convert x into square form.

Convert the whole expression into square form.

Simplify.

Subtract 6 from both sides.

Divide by coefficient.

Rewrite in standard form.
The radius of the circle will be -2. Also, no matter what the sign says, the radius has to always be positive.
Have a nice day! :)