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Question
Radium-226 has a half-life of 1600 years.A) Find the continuous decay rate. Write your answer as a percent rounded 4 decimal places.
B) Then find the age of a fossil that has 67% of it's original Radium-226 left?
Round your answer to the nearest year.
Answer
This answer is hidden. It contains 19 characters.
Related questions
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The following equation represents the best-fit regression line for median personal total income of adult males vs. years of education past eighth grade in Northern Wisconsin.
Median personal income = 5,813 + 5,567 years of education
What would be the expected annual personal income of a male who had 8 years of education past eighth grade?
Q:
The following equation represents the best-fit regression line for median personal total income of adult males vs. years of education past eighth grade in Northern Wisconsin.
Median personal income = 4,370 + 5,796 years of education
What would be the expected annual personal income of a male who had 0 years of education past eighth grade?
Q:
Create an estimate of a linear model for this data. Use points C and E from this table to estimate the slope, and then use point C to estimate the vertical intercept. Round the answers to 2 decimal places. Ounces of Polymer in Mold
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This table shows the final exam scores (y) compared to the hours studied (x) for 5 randomly selected students. Time spent Studying (hours)
Final Exam Score A
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81 A). Use points A and D from this table to estimate the slope of the linear model for this data.
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Use points D and E from this table to estimate the slope of the linear model for this data. Advertising Expense ($1000s)
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Q:
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Q:
The table below gives the life expectancy of a child (at birth) in the United States for selected years from 1920 to 1990.
(Source: Department of Health and Human Services) Year
1920
1930
1940
1950
1960
1970
1980
1990 Life expectancy
54.1
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Between 1930 and 1940, the life expectancy of a child increased by A)___________ years of life which is an average increase of B)___________ years of life expectancy each year.
Round answers to 2 decimal places if necessary.
Q:
The graph below shows the number of birds at a bird feeder as a function of time. What event most likely occurred during interval E?
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Q:
On what interval is this graph increasing. State your answer in interval notation.
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Over what interval is the function concave down?
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The following graph shows the population (in thousands) of two cities, City 1 and City 2. What was the difference in population (To the nearest 1,000.) between the two cities in 2000?
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Over what interval(s) is the function positive?
Write your answer in interval notation. If two intervals are needed, write your answer in the form .
Q:
If Fancis pays 23% of each paycheck for payroll deductions, which function would properly describe her take-home pay, T, as a function of her gross pay, p?
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C) T = (1 - 23) p
D) T = (1 - 0.23) p
Q:
Solve the following equation for y in terms of x and then express in f(x) form.
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Find an equation that represents the relationship between x and y in this table: x
y -1
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-8 1
-8 2
-8 3
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Find an equation that represents the relationship between x and y in this table: x
y -2
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4 0
1 1
-2 2
-5
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Determine if this set of points represents a function.
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Q:
A taxi company has the following fare policy: any trip of 5 miles or less costs $5.00 and the cost for each additional mile is $0.35. The company will not make a trip longer than 30 miles.
Which formula and domain best describe the relationship between the cab fare, f, and the length of the trip, t, 5 miles or longer.
A) ; Domain: [5,30]
B) ; Domain: [0,)
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Q:
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For the given equation , which could never be a value of y?
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Q:
Which graph displays the solutions to the equation below? A) B) C)
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Determine whether the ordered pair, (-3,-5), satisfies the equation.A) NoB) Yes
Q:
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Q:
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Q:
The bar chart below was created using the number of children of each of the last 20 U.S. Presidents. Find the relative frequency of presidents who had 3 children.