Allison's car holds 15 gallons of gas. On a long trip, she fills the tank completely twice. The first time it costs $2.50 a gallon. If she spends a total of $76.50 on gas, how much did gas cost per gallon for the second tank?
A. $2.60
B. $2.50
C. $5.10
D. $2.80

Compute the standard deviation of the following set of data to the nearest whole number. 10, 10, 15, 20, 25

Ken leaves work 20 minutes late. he decides to make up time by taking the toll road instead of side streets. he can travel three times faster by taking the toll road. create an equation to represent his total travel time, including wait time, where x is the number of minutes the drive was expected to take

Rationalize the denominator of fraction with numerator square root of negative 36 and denominator the quantity of 2 minus 3i plus the quantity 3 plus 2i