A jewelry store is featuring a diamond in the shape of a square pyramid. The side length of the diamond is 8 millimeters and the slant height is 6 millimeters.

)a smart phone has dimensions of 4.9 inches (height), 2.3 inches (width) and 8.0 millimeters (depth). what is the volume of the smart phone in cubic centimeters? (1 in = 2.54 cm)

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

Can someone factor this fully? my friend and i have two different answers and i would like to know if either of them is right. you in advance. a^2 - b^2 + 25 + 10a