4.3+Calculating+Costs+and+Profits

FA 20/9/08 Math7c Day 13

Big Idea: Observation and description of changes in the world around us are the first steps in finding and learning about patterns.

Essential Question: How can I use graphs, tables and symbols to solve problems?

4.3 And F.U.

Notes: A Rule has to have an ‘is’ in it to be a Rule. An Equation has to have an ‘=’ in it to be an Equation. ‘Is’ = ‘=’. ‘n’ stands for the number of customers. You will need to use your table from problem 3.4.

4.3- Calculating Costs and Profits A.	Write an equation for the rule to calculate each of the following cost for each number, n, of customers. 1. Bike rental   A1) b=30n		2. food and camp costs   A2)  f=125n 3. Van rental  A3) v=700

B.	Write an equation for the rule to determine the total cost for any number, ‘n’, of customers. B) t=855n

C.	Write an equation for the rule to determine the profit for any number, ‘n’, of customers. C) p=-505n

Follow up- 4.3 1.	Theo’s father has a van he will let the students use at no charge. Which of these equations represents the total cost if they use his van? A. c=125=30 				B. c=125n+30 C. c=155					D. c=155+n 1) B

2.	If the partners require the customers to supply their own bikes, which of these is the new equation for total cost? (Assume the students will rent a van.) A. c=125n+700				B. c=125+700+n C. c=825n					D. c=350n+125n+700 2) A

3.	If customers must supply their own bikes, which of the equations below represent the profit? (Assume the students will rent a van.) A. p=350-(125+700+n)			B. p=350n-125n+700 C. p=350-(125n+700)			D. p=350-125n-700 3) D