What is the gradient of the blue line

An advertising firm has an old computer that can prepare a whole mailing in 6 hours. with the of newer model the job is complete in 2 hours. how long would it take the newer model to do the job alone?

Find the height of a square pyramid that has the volume of 32 ft.³ and a base lengthof 4 feet

Look at this pattern ; 1,4,9, number 10000 belongs in this pattern . what’s the place of this number?