Exercise A: Patterns --Finding Formulas and Missing Values 1.
Andre selts silicon cell phone covers at his stall. His fixed cost is R500 per month and he
pays R25 per cell phone cover. His costs are shown in the table below:
Number of items (n)
144 4
2 3 10
Total cost in Rand (0) 500 525 550 575
875
(a) Find the formula for calculating his total cost. Use C for total cost and n for the
number of cell phone covers.
(b) Hence, calculate the values of the unknown letters. Show all your steps.
0
1
В
A​

typically if you want , you would actually put questions here for us to you. but hey, that's just me. maybe someone will magically answer the questions for you without knowing what they are.

nope.   happens to me as well.

-aparri

ending amount = beginning amount / (2^n)

where "n" = number of half-lives (or elapsed time / half-life)

ending amount = 50 mg / (2 ^10 / 5.3)

ending amount = 50 mg / (2 ^ 1.8867924528)

ending amount = 50 m / 3.6981210597

ending amount = 13.5203794557 mg

or about 13.5 mg remain

source: