1 of 8 0-day streak

Investigating systematic changes in formulas

Question 1 of 8

Calculator allowed

A fictional kit-order rule gives total cost C in dollars for quantity n, unit price p dollars per kit and one fixed fee f dollars

C=pn+f

All listed quantities are whole numbers of kits; the fee is added once, not once per kit

Only n varies. Keep p = 4 and f = 4 fixed throughout this table

(a)4 marks

Complete every cost in the table before comparing the settings

n	p ($)	f ($)	C ($)
2	4	4	?
3	4	4	?
4	4	4	?
5	4	4	?

Cost for n = 2, p = 4, f = 4 Cost for n = 3, p = 4, f = 4 Cost for n = 4, p = 4, f = 4 Cost for n = 5, p = 4, f = 4

(b)1 mark

Find the change in total cost between the first two rows. This is the change for each equal n-step in this table

Signed change in cost (dollars)