Promise Easy Points Calculate the average monthly expenses for these individuals?

Kelsey spent $350 in May, $432 in June and $420 in July. Her average monthly expenses are:

Michael spent $700 in April and May and $800 in June and July. His average monthly expenses are:

$420+$350+$432=kelsey's monthly expenses  

$700+$800=Micheal's Monthly expenses

c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.