Can someone help me.

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?

Olive's solar powered scooter travels at a rate of 30 miles per hour. what equation can she use to calculate her distance with relation to the time she traveled? h=hours m=miles 1. h=m+30 2. m=30h 3. m=h+30 4. h=30m

Sara made $253 for 11 hours of work. at the same rate how much would he make for 7 hours of work?