The coordinates of a and b are (1,2) and (2,3). find the coordinates of r so that ar/rb=4/3

Askateboard ramp is in the shape of a right triangle what is the height of the ramp

Qrst is a parallelogram. determine the measure of ∠q pls

What is the value of the discriminant, b2 ? 4ac, for the quadratic equation 0 = x2 ? 4x + 5, and what does it mean about the number of real solutions the equation has?