Find the surface area of the equilateral triangular pyramid A.720 cm B.912 cm C.1104 cm D. 1824 cm

Me, prove a quadrilateral with vertices g(1,-1), h(5,1), i(4,3) and j(0,1) is a rectangle using the parallelogram method and a rectangle method.

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?

Julie begins counting backwards from 1000 by 2’s and at the same time tony begins counting forward from 100 by 3’s.   if they count at the same rate, what number will they say at the same time?