Write the equation of the circle centre origin, radius 3/2

If 10 men take 18 days to mow 60 acres of grass, how long will 15 men take to mow 80 acres?

The pyramid below was dissected by a horizontal plane which shape describes the pyramid horizontal cross section

Evaluate the discriminant of each equation. tell how many solutions each equation has and whether the solutions are real or imaginary. x^2 - 4x - 5 = 0