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3 years ago

Grace starts with 100 milligrams of a radioactive substance. The amount of the

Mathematics

2 answers:

love history [14]3 years ago

8 0

Answer:

100 is grace's initial amount. w is how much of the substance is being decrased each week. in ryan's equation, 1 is 100% of the substance, so the initial amount, and 0.4 is the amount that is being decreased.

Step-by-step explanation:

Leona [35]3 years ago

4 0

Answer:

100= Initial Amount

1/4= decay factor for each week

w= number of weeks

1/4w= decay factor after w weeks

1 - 0.4= decay factor for each week

w= number of weeks

0.4= percent decrease

Step-by-step explanation:

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The weekly earnings of students in one age group are normally distributed with a standard deviation of 47 dollars. A researcher

ELEN [110]

Answer:

Option D) 340

Step-by-step explanation:

We are given the following in the question:

Alpha, α = 0.05

Population standard deviation, σ = $47

Margin of error = 5

95% Confidence Interval:

$\mu \pm z_{critical}\frac{\sigma}{\sqrt{n}}$

$\text{Margin of error} = z_{critical}\frac{\sigma}{\sqrt{n}}$

Putting the values, we get,

$z_{critical}\text{ at}~\alpha_{0.05} = 1.96$

$5 = 1.96(\dfrac{47}{\sqrt{n}} )\\\\\sqrt{n} = \dfrac{47\times 1.96}{5}\\\\n = 339.443776\\\Rightarrow n \approx 340$

Thus, the correct answer is

Option D) 340

7 0

2 years ago

12. SALES Last month, a retailer sold 120 jar candles at $30 per candle. This month the retailer is considering putting the cand

tatiyna

Answer:

1200

Step-by-step explanation:

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8 0

2 years ago

Which one of the following statements is true of perpendicular lines? A. They intersect to form an obtuse angle. B. They interse

quester [9]

They intersect at one point

6 0

3 years ago

Read 2 more answers

One number is 20 times another number. The product of the two numbers is 180. Write an equation and use it to find all pairs of

nadezda [96]

Y = 20x

y • x = 180

180/x = y

180/x = 20x

180 = 20x^2

x^2 = 6

x = + or - 3

Therefore y must equal + or - 60.

8 0

3 years ago

Read 2 more answers

Gary won $70,000 in the lottery after all tax deductions. He invested part of the money at 11% and deposited the remainder in ta

Tju [1.3M]

X - invested for the money at 11%
70 000 - x - deposited at 12%

0.11x + 0.12(70000-x)=7900
0.11x + 8400 - 0.12x = 7900
8400- 7900 = 0.01x
500 = 0.01x
x=50 000 invested at 11%
rest (20K) invested at 12%

4 0

3 years ago