Answer:
5.19 for the roast beef & 2.39 for the cheese. 7.58$
10.00$-7.58$=3.42$
20.808 would be the diagonal, or, also known as, the hypotenuse. We use pythagorean theorem for problems like these.
Answer:

Step-by-step explanation:
<u><em>The question in English is</em></u>
The monthly cost in a gym, and, is proportional to the number of times the client visits the gym, what equation represents the relationship between the monthly payment and the number of visits?
we know that
A relationship between two variables, x, and y, represent a proportional variation if it can be expressed in the form
or 
k represent the constant of proportionality or slope of the linear equation
In this problem
Let
x ----> the number of times the client visits the gym in a month
y ---> the monthly cost in a gym
therefore
