I used a calculator and have solved it without. I didn't get any of these answers. HELP

Which expression converts 45 degree to radians

Mr. brettler is hanging up a 5-foot tall rectangular welcome sign in the gym. he has drawn a sketch on a coordinate grid. he has the lower vertices of the sign at (9, –3) and (–6, –3). where would the upper vertices be on the grid?

Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'