Could someone help me please

Duff has 2 sandwiches and 3 bags of chips. Duff's total cost would be $18.5

Step-by-step explanation:

We know that chips cost $1 per bag. We also know that sandwiches cost (s). It shows that there is 2s, therefore being two sandwiches and 3 chip bags. Duff's total cost would be $18.5. It's because if sandwiches cost $7.75, and he has two, we multiply it by x2. The answer to that, would be $15.5. We also know that he has 3 bag of chips, therefore adding $3. So in total, Duff's total is $18.5.

marco saved more.   he saved $35 more.

step-by-step explanation:

1+2+3+4+5+6+7+8+9+10 = 55

2*10 = 20

55-20 = 35

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: