Pipe a takes 10 hrs to fill a tank but due to a leakage, it takes 5 hrs more. how long will a leak take to empty the tank if it is completely filled?

Factor the polynomial 8y^2 - 72 btw "^" means exponent

Expresa commuter train leaves downtown sation and travels at a average speed of 55 miles per hour towards the north side sation, which is 50miles away. thirty minutes later, express commuter train #7 leaves north side and travels at a average speed of 35miles per hour towards downtown sation. at the moment the two trains pass each other, how far(in miles) is train #12 from the downtown sation and how long(in minutes) has the #12 train been traveling

Acomputer store bought a program at a cost of $10 and sold it for $13. find the percent markup