The first one i need with that one

5% Sales tax is $3.375 and total amount is $70.875. I don't know if they want u to simplify or not so I'll leave the answer this way just incase.

Step-by-step explanation:

You do cross multiplication.

1. ?/67.50 = 5/100

2.  then you cross multiply 67.50 x 5 = 337.5

3. Divide 337.5 by 100 = 3.375

true

step-by-step explanation:

the direct variation says that:

then the equation is of the form is given by:

            where k is the constant variation.

from the given table:

consider any value of x and m(x)=y

x = 2 and m(x)=y = 3

substitute these value in [1]; we have;

divide both sides by 2 we get;

⇒

check:

put x = -1 and m(x) = -1.5

substitute in the equation:

-1.5 = -1.5                   true

therefore, the function m(x) represents a direct variation

graph of this function as shown below: