can i get some soultions

Which of the following methods for estimating the variable and fixed elements of a mixed cost relles on an analyst's prior knowledge of how the costs in the account behave? Multiple Choice O Least-squares regression O The engineering approach Account analysis The high-low method In a cost-volume-profit (CVP) graph, the vertical distance between the total expense line and the fixed expense line represents which of the following? Multiple Choice The net operating Income The total variable expenses The total contribution margin The break-even point Which of the following is not an underlying assumption of cost-volume-profit analysis? Multiple Choice Net operating Income is constant. Selling price is constant. Variable costs per unit are constant Total fixed costs are constant within the relevant range