Marrisa added 1.56 and 13.47. she got 29.07. what mistake could marrisa have made? she forgot to move the decimal point to the left after she added. she lined up the front numbers instead of the decimal places. she lined up the last numbers instead of the decimal places. she didn’t carry correctly between place values.

She lined up the front numbers instead of the decimal places

she did this :      13.47
                          1.56-
                        add
                          29.07

when she should have lined up the decimals

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.