I WILL MARK BRAINIEST

What are the soultion(s) to the quadratic equation 40- x^2=0

What happens to the area as the sliders are adjusted? what do you think the formula for the area of a triangle is divided by 2?

Astudent must have an average on five test that is greater than it equal to 80% but less than 90% to receive a final grade of b. devon's greades on the first four test were 78% 62% 91% and 80% what range if grades on the fifth test would give him a b in the course? ( assuming the highest grade is 100%)