Question

jane has a 5x7 inch photograph that she wants enlarged to a 10x14 inch

Answer 1

the scale factor is 2 so you would increase each length by 2

Answer 2

im not sure if this will help

5*7 ----->  5/7
10*14 ------> 10/14

do 5 * 2 =10
do 7* 2 = 14

You have to multiply it by 2 to get the 10*14 inch
Hope this helps :D