Evaluate the following for a = -20, b = 30, c = 5 | 2a | - b | bc | - | ac | very confused need

Which is equivalent to 10/12? options: 10/18 5/6 3/12 9/11

Aiden drives to school and back each day. the school is 16 miles from his home. he averages 40 miles per hour on his way to school. if his trip takes 1 hour, at approximately what speed does aiden drive home?

James adds two numbers a + b. sally adds the same two numbers but reverse the order b + a what property of addition assures us that james and sally will get the same sum