How does 2+2=4 and 2x2=4 but 3x3=9 and 3+3=6

If a baby uses 15 diapers in 2 days, how many diapers will the baby use in a year?

When the solutions to each of the two equations below are graphed in the xy-coordinate plane, the graphs of the solutions intersect at two places. write the y-cordninates of the points of intersection in the boxes below in order from smallest to largest. y=2x y=x^2-3

What value of x is in the solution set of 4x – 12 s 16 + 8x?