Plz pl

dev has 9 shells. zoe has 55 shells, zoe gives some shells to dev. now zoe has 3 times as many shells as dev. how many shells does zoe give to dev.

David must install fencing around a lot that is shaped like a right angle.the side of lot that runs east-west is 200 ft long.the side of the lot runs north-south is 125 ft long.calculate how many feet of fencing he will need to surround the entire lot.

Enter the missing numbers in the boxes to complete the table of equivalent ratios.time (min) distance (km)? 36 9? 1512 ?

If x = -2, then x 2-7x+10 equals a. 0 b.20 c.28