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1. An unknown radioactive element decays into non-radioactive substances.In ' 1000' days the radioactivity of a sample decreases by '62' percent.
(a) What is the half-life of the element?
(b) How long will it take for a sample of '100' mg to decay to '87' mg?
In what year did/will the exports reach $9.7 billion?
size of u.s. states. the total surface area (in square miles) for each of six selected Eastern states is listed here. Which set is more variable?
A spherical weather balloon is being inflated. Beginning at 11 cm, the radius of the balloon is increasing at the rate of 2 cm per second. Express the surface area of the balloon as a function of time (in seconds).
Solve the two first order ODEs below for three time steps using h = 0.2 and RK 2. x'1=x2; x1(0)=.5 x2'=-x1-2x2 + e^-t ; x2(0)=0
the frequency distribution below shows the distribution for checkout time in minutes in umuc minimart between 300 pm
Write and graph a linear equation
Suppose you add the number of functions mapping onto J over all possible subsets J of N. What simple value should this sum equal?
What is the length of a ramp with a 12-ft horizontal leg and a 1-ft vertical leg? Give an exact answer and an approximation to three decimal places.
Calculate the second derivative of f find where f is concave up concave down and has inflection points. Find any horizontal and vertical asymptotes of f.
How many bacteria in the original solution?
on august 18, the ferrnandez family received 19 pieces of mail consisting of magazines, bills, letters, and ads. if they received the same number of magazines as letters, three more bills than letter, and five more ads than bills, how many magazin..
Thirty workers complete a project in 20 days. For the project to be completed in 10 days, how many additional workers are needed if each new worker is only half as productive as the original group?
suppose that you save for retirement by contributing the same amount each month from your 25th birthday until your 65th
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