Graph of 5y-10=0 please help

Dilations map circles to circles and ellipses to ellipses with the same. true or false

How many $20 bills do you need to have to make $280

Mallory has been offers two different jobs. she can baby sit for 6 hours a week and get $8.50 an hour. or she can work at the library for 14 hours a week and make $5.50 an hour. which job will allow her to save the most money after 6weeks?