Find the sum and express it in simplest form. (3a2+2a)+(5a2-a-7)

When you add 3a squared and 5a squared, you get 8a squared. 2a-a=a, with 7 leftover. the final answer would be 8a2 + a - 7

At a constant it will take one hour to travel 32 mi.at that speed it will take 1/2 hr to travel the remaining 16 mi.it will take 1+1/2 hr to travel the 48mi @ 32mph.so 1 hr = 60 min& 1/2 hr = 30 min1+1/2 hr = 90 min.there are 60s in each 90 × 60 = 3600 seconds.the real question seriously is he why are they driving so slow? ! lol.