David noticed that 49=7, what are other numbers between 1 and 100 have exactly three factors

He mass of a single atom of carbon can be found by dividing the atomic mass (12.01 g) by 6.022 x 10^23. which is the mass of a single carbon atom, correctly written in scientific notation with the correct number of significant figures?

What is the slope of any line parallel to the line 8x+9y=3 in the standard (x,y) coordinate plane?

If 5x - 2 = -12, then x = a) -50 b) -4.4 c) -2.8 d) -2