How many edges does a triangular pyramid have

Find the area of an equilateral triangle with a side of 6 inches

X+y=-4 x-y=2 use elimination with adding and subtraction

Which of the following are arithmetic sequences? check all that apply. a. 0.3, 0.6, 0.9, 1.2, 1.5, b. 2, 3, 6, 11, 18, c. 150, 147, 144, 142, d. 2, 4, 9, 16, 25,