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a lifeguard earns $320 per week for working 40 hours plus $12 per hour worked over 40 hours. a lifeguard can work a maximum of 60 hours per week.

which graph above best represents the lifeguard’s weekly earnings in dollars for working h hours over 40?

a) answer choice f
b) answer choice g
c) answer choice h
d) answer choice j

just took the test and my answers down below!

step-by-step explanation:

check the pic :

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: