The answer is -12 hope this helps
Answer: 223.77 minutes
Step-by-step explanation:
For this exercise you need to use the following formula:

Where
is the individual time for object A,
is the individual time for object B and
is the time for A and B working together.
In this case, analizing the information given in the exercise, you can identify that:

Knowing these values you can substitute them into the formula and then you must solve for "t" in order to calculate how long will it take working together.
You get that this is:

Mixed fraction.
It is called mixed fraction because there is a combination of a whole number and a fraction.
Answer:
She spent $70.65.
Step-by-step explanation:
Represent the amount spent by x.
Then $22.50 - x = -$48.15.
Combining like terms, we get:
$22.50 + $48.15 = x, or
x = $70.65
She spent $70.65.