In the diagram above, PQR is a straight line and PS is a tangent to the circle QRS with /PS/ = /SR/ and ∠SPR = 40°. Find ∠PSQ

A triangle has vertices P(-1,6), Q(-3, -4) and R(1, -4).Find the midpoint of PQ and QR respectively.

The mean of the numbers 3, 6, 4, x, and 7 is 5. Find the standard deviation.

If the 2nd and 5th terms of a G.P are 6 and 48 respectively, find the sum of the first four for term