James and Luke are able to read 7
5√7 + 12√6 - 10√7 - 5√6
Write it like this:
(12√6 - 5√6) + (5√7 - 10√7),
as the 12 and 5 are both being multiplied by √6, they can be added or subtracted and its the same with 5 and 10, so it becomes:
7√6 - 5√7
You should leave it like this.
A batch contains 0.75 cup of lime juice.
The recipe of guacamole uses 12% of lime juice of a normal batch. This means that it contains less amount of lime juice, it contains 12% of 0.75
12% of 0.75 cup is 0.12 × 0.75, which is 0.09
The batch of guacamole was pretty small as it only contains 0.09 cup of lime juice.