If a company decreases its total fixed expenses while increasing the variable expense per unit, the total expense line relative to its previous position on a cost-volume-profit graph will:

a. Shift downward and have a flatter slope.

b. Shift upward and have a flatter slope.

c. Shift upward and have a steeper slope.

d. Shift downward and have a steeper slope

Given the cost formula Y = $13,000 + $7.00X, the total cost for an activity level of 3,000 units would be:

a. $13,000

b. $34,000

c. $18,000

d. $21,000

Please please, I don't have enough time to help me