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Furkat [3]
3 years ago
6

A store sells a package of 25 trading cards for $5.25. Explain how you can tell that the unit price is less that $1. What is the

unit price per card?
Mathematics
1 answer:
Burka [1]3 years ago
7 0

Answer:

The numerator is smaller than the denominator what you divide 5.25 by 25 so the unit price is going to be less than 1.

The unit price is $0.21

Step-by-step explanation:

25 cards = $5.25

5.25/25 = $0.21

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we are given half-life of PO-210 and the initial mass

we want to figure out the remaining mass <u>after</u><u> </u><u>4</u><u>2</u><u>0</u><u> </u><u>days</u><u> </u>

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\displaystyle f(t) = a {0.5}^{t/T}

where:

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since it halves every 140 days our T is 140 and t is 420. as the initial mass of the sample is 5 our a is 5

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\displaystyle f(420)=5\cdot{0.5}^{420/140}

reduce fraction:

\displaystyle f(420)=5\cdot{0.5}^{3}

By using calculator we acquire:

\displaystyle f(420)=0.625

hence, the remaining sample after 420 days is 0.625 kg

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