MOD HF 1.5-1.6 Formative Assessment

Find the rate of change for the data graphed on the line.

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A company that manufactures radios first pays a start-up cost, and then spends a certain amount of money to manufacture each radio. If the cost of manufacturing r radios is given by the function c(r) = 5.25r + 125, then the value 5.25 best represents

• the start-up cost

• the profit earned from the sale of one radio

• the amount spent to manufacture each radio

• the average number of radios manufactured

The amount Mike gets paid weekly can be represented by the expression 2.50a  290, where a is the number of cell phone accessories he sells that week. What is the constant term (which is the y-intercept on a graph) in this expression and what does it represent?

• 2.50a, the amount he is guaranteed to be paid each week

• 2.50a, the amount he earns when he sells a accessories

• 290, the amount he is guaranteed to be paid each week

• 290, the amount he earns when he sells a accessories

What is the relationship between the independent and dependent variables in the scatter plot shown below?

• undefined correlation

• negative correlation

• positive correlation

• no correlation

The scatter plot shows the profit, by month, for a new company for the first year of operation. Kate drew a line of best fit, as shown in the diagram. Using this line, what is the best estimate for profit in the 18th month?

• $35,000

• $37,750

• $42,500

• $45,000

A scatter plot was constructed on the graph and a line of best fit was drawn. What is the equation of this line of best fit?

• y = x + 5

• y = x + 25

• y = 5x + 5

• y = 5x + 25