Can you please help me? The mathematical model C(x) = 400x + 70,000 represents the cost in dollars a company has in manufacturing x items during a month. Based on this, how much does it cost to produce 100 items?

Steve wants to develop a way to find the total cost of any item including sales tax. the sales tax in his city is 6%. his friend jenna writes the expression x + 6x where x is the cost of the item. explain whether her expression is correct based on the situation.

Apositive number a or the same number a increased by 50% and then decreased by 50% of the result?

The ratios 3: 9, 4: 12, 5: 15, and 6: 18 are a pattern of equivalent ratios in the ratio table. which is another ratio in this pattern?