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Ierofanga [76]
3 years ago
12

There was a sample of 650 milligrams of a radioactive substance to start a study. Since then, the sample has decayed by 7.8% eac

h year.
Let t be the number of years since the start of the study. Let y be the mass of the sample in milligrams. Write an exponential function showing the relationship between t
and y
.
Mathematics
1 answer:
Nimfa-mama [501]3 years ago
5 0

Answer:

y = 650·0.922^t

Step-by-step explanation:

At the end of each year, 92.2% of the amount at the beginning of the year remains. That is, the beginning amount is multiplied by 0.922. The exponent t in 0.922^t tells how many times (years) that multiplication has taken place. At the end of t years, the amount remaining in milligrams (y) is ...

y = 650·0.922^t

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On a necklace of 100 beads, 45 of the beads are round. The rest of the
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45% round 55% rectangular

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You want to put $2,500 in a simple interest account. It has a 4% annual interest rate. How long will it take you to earn $200 in
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The formula is
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Help me out now Please I'm stuck on this
Elena-2011 [213]

5x + 2(x + 1) ≤ 23

Distribute the 2.

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8 0
3 years ago
Isaiah And Cooper work at a dry cleaner Ironing shirts.isaiah can iron 25 shirts per hour, and Cooper can iron 30 shirts per hou
neonofarm [45]

Answer:

Step-by-step explanation:

340/25 = 13.6 = 13 hours and 10 min

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25x+30y= 340 and y=2x can be used to determine the number of hours cooper worked and the number of hours isaiah worked. Where x Isaiah 's working hours and y is cooper's working hours.

Step-by-step explanation:

Isaiah ironing rate per hour = 25 shirts

Cooper ironing rate per hour = 30 shirts

Total shirts pressed = 340

Let,

Isaiah´s number of hours = x

Cooper's number of hours = y

According to given statement;

25x+30y=340   Eqn 1

Hudson worked twice many hours as grace.

y = 2x    Eqn 2

Keywords: linear equations, variables

Learn more about variables at:

brainly.com/question/4837736

brainly.com/question/4805611

#LearnwithBrainly

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