Assume w = 40 ft and d = 40 ft. the dead load for all floors and roof is 15 psf. the unreduced roof live load is 20 psf. the live load on the second and third floors is 65 psf, and the live load on the fourth floor is 40 psf. compute the total dead and live load per lrfd load combinations in the following columns; a1 between third and fourth floor and d2 between between ground and second floor.

50.6

step-by-step explanation:

3 is greater then both of those numbers

in the attachment.   i didn't see your choices.   the word which means there is choices.

step-by-step explanation:

(x,y)

x tells you how much left or right you go from the origin

y tells you how much down or up you go from the origin

so for example (-3,2), you go left 3 and up twice. i denoted which of the ordered pairs is which in my graph.