What are the more appropriate measures of center and spread for this data set?

Select two choices: one for the center and one for the spread.
O A. Better measure of spread: standard deviation
B. Better measure of center: mean
C. Better measure of spread: interquartile range (IQR)
D. Better measure of center: median

It is saturday morning and jeremy has discovered he has a leak coming from the water heater in his attic. since plumbers charge extra to come out on the weekends, jeremy is planning to use buckets to catch the dripping water. he places a bucket under the drip and steps outside to walk the dog. in half an hour the bucket is 1/5 of the way full. what is the rate at which the water is leaking per hour?

Me! i really need to get this right before 9. prove the divisibility of 7^6+7^5-7^4 by 11. use factoring so you get a number times 11. just tell me the number. i need this done asap

Solve the following pair of equations for x and y: ax/b_ by /a= a +b; ax - by = 2ab