Jamal buys postcards of washington, d. c., for $10.20, not including tax. each postcard cost $0.85. how many postcards did jamal buy? (giving 20 points to first one who answers it)

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.

Solve: 3x+y=6 4x-2y=18 show all work !

Jack did 3/5 of all problems on his weekend homework before sunday. on sunday he solved 1/3 of what was left and the last 4 problems. how many problems were assigned for the weekend?