Write an equation that models the conditions, then to solve the equation.What number is 76% of 40?
A. 304
B. 30,400
C. 30.4
D. 3040
Answer: C
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Solve the problem.In 1998, the population of Country C was 28 million, and the exponential growth rate was 1% per year. Find the exponential growth function.
A. P(t) = 280.01t , where P(t) is in millions and t is the number of years after 1998. B. P(t) = 28e0.01t, where P(t) is in millions and t is the number of years after 1998. C. P(t) = 28e0.01, where P(t) is in millions and t is the number of years after 1998. D. P(t) = 28e1t, where P(t) is in millions and t is the number of years after 1998.
Use a system of linear equations to solve the problem.Brenda has two containers of water for a camping trip. One container holds 3 times as much as the other. The total amount of water is 32 gallons. How much water is in each container?
A. 8.5 gal; 23.5 gal B. 7 gal; 25 gal C. 8 gal; 24 gal D. 32 gal; 8 gal
Solve.Mara can type 55 words per minute. How many words would she type in 
hour (45 minutes)?
A. 41 words B. 1856 words C. 2475 words D. 73 words
Is the set of all squares of positive integers countable? That is, is the set S = {m ? Z | m = k^2 for some positive integer k} a countable set. Justify your answer.
What will be an ideal response?