Simplify the expression using order of operation 5 x 2 + 3 to the power of 2

Which expression is equivalent to −16y+13 ? −16(−y+13) 16(−y+2) −16(y+2) 16(−y+13)

Which expression is equivalent to (3^2)^-2 a.-81 b.-12 c.1/81 d.1/12

50 ! pls ! 12.  building codes regulate the steepness of stairs. homes must have steps that are at least 13 inches wide for each 8 inches that they rise.

a. discuss how to find the slope of the stairs.
b. describe how changing the width or height affects the steepness of the stairs.