please slove numbers 2,3,4 and 6

With a variable cost, as the level of activity decreases, the total cost remains the same. True False Question 3 The contribution margin is the difference between sales and fixed costs. True False Contribution margin = Sales revenue Total variable costs. True False Suppose you are charged a $10 per month base charge for your electrical service. You are also charged an additional $0.08 for every kwh of electricity you use. The cost is an example of a mixed cost. variable cost. fixed cost. step cost. With a variable cost, as the level of activity decreases, the total cost remains the same. True False Question 3 The contribution margin is the difference between sales and fixed costs. True False Contribution margin = Sales revenue Total variable costs. True False Suppose you are charged a $10 per month base charge for your electrical service. You are also charged an additional $0.08 for every kwh of electricity you use. The cost is an example of a mixed cost. variable cost. fixed cost. step cost