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Sonbull [250]
2 years ago
15

Jack saved 2 pennies today. If he doubles the number of pennies he saves every day, how many more days will it take until he has

saved more than a 1000 pennies?
Mathematics
1 answer:
slavikrds [6]2 years ago
3 0

Answer:

> 499 days

Step-by-step explanation:

The unknown here is the number of days it will take to save over 1000 pennies.  Instead of an equation this is an inequality.  The phrase "more than 1000 pennies" is > 1000.  Now we need to figure out WHAT is more than 1000.  If Jack starts with 2 pennies today, that is our "fixed" number.  To that starting number of pennies we are doubling the number of pennies per day.  Doubling means we are multiplying by 2.  The mathematical expression for "doubling the number of pennies per day" is 2x.  Adding in our starting amount of 2 pennies, we have

2x + 2 > 1000 and

2x > 998 so

x > 499

This means that it will take more than 499 days to get more than 1000 pennies.  It will take 500 days to get exactly 1000, but that is not what we are asked to find.

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Juan bought "g" video games for $35 each. Which expression represents how much he spent on the games?
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Answer:

g X 35

Step-by-step explanation:

3 0
2 years ago
The temperature of a cup of coffee varies according to Newton's Law of Cooling: dT dt equals negative k times the quantity T min
denis23 [38]

Answer:

  (b)  67

Step-by-step explanation:

A solution to the differential equation describing the temperature according to Newton's Law of Cooling could be written as ...

  T = (final temp) + (initial difference)×(decay factor)^t

where the decay factor is the fraction of change during 1 unit of time period t.

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Here, the initial difference of 100-25 = 75 degrees decays to 90-25 = 65 degrees in 1 minute. So, the units of t are minutes, the decay factor is 65/75, the initial difference is 75 degrees, and the final temperature is 25 degrees. That lets us write the equation as ...

  T = 25 +75(65/75)^t

Then for t=4, the temperature is ...

  T = 25 +75(13/15)^4 ≈ 67.3 . . . . degrees

After 4 minutes the temperature of the coffee is about 67 degrees.

4 0
1 year ago
What percent is equivalent to 1/25<br><br> A. 4%<br> B. 5%<br> C. 20%<br> D.25 %
Ratling [72]

Answer:

i believe its A.4%

Step-by-step explanation:

8 0
3 years ago
Read 2 more answers
A production manager randomly sampled production lines at a factory that produces automobiles. She wanted to find out how many p
Elena-2011 [213]

Answer:

The confidence interval for the proportion of production lines that caused defects is (0.07, 0.09).

Step-by-step explanation:

A confidence interval for a population proportion is a function of the sample proportion and the margin of error.

The interval has two bounds, a lower bound and an upper bound.

The lower bound is the sample proportion subtracted by the margin of error.

The upper bound is the margin of error added to the sample proportion.

In this problem, we have that:

Sample proportion 0.08

Margin of error 0.01

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The confidence interval for the proportion of production lines that caused defects is (0.07, 0.09).

5 0
3 years ago
What is the answer????
morpeh [17]
2.5 cans of food ......
7 0
3 years ago
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