Valerie ate 5 cookies from the cookie jar. then she baked a dozen cookies and put the in the jar. What is the net change of number of cookies in the jar.

There are x cookies in the jar to start.

Valerie then eats 5. There are now x-5.

She then adds 12. There are now x+7.

Net change: +7

on monday rodney ate 1/4th of the sandwich = 3/12

on tuesday he ate 1/3rd of the sandwich = 4/12

therefore in total he has eaten = 3/12 + 4/12 = 7/12

thus we can say that he has eaten 7/12 of the sandwich on monday and tuesday alltogether.

happy to

pls mark as brainliest.

use distributive property on all like terms and change your signs if you have a double negative or if you have positive/negative