For problems 7-12, solve the equations. If the solution is irrational, round to the nearest ten-thousandth.
A. 
B. 
C. 
D. 
E. none of these
Answer: D
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Solve the equation.a + 4 = 7
A. -3 B. -11 C. 3 D. 11
Solve the problem.In a biology experiment, a scientist collected 8810 mosquitoes in a field and 5283 mosquitoes in an urban area. How many mosquitoes did she collect altogether?
A. 14,093 mosquitoes B. 3527 mosquitoes C. 4564 mosquitoes D. 13,746 mosquitoes
Solve the problem.The marriage rate in a certain country in 1990 was 0.9%, and there were about 435,000 marriages that year. Use the model M(t) = M0(1 + r)t, with a constant marriage rate and t = 0 corresponding to 1990 to estimate the year in which the number of marriages will be 1 million.
A. 2000 B. 2340 C. 2093 D. 2083
Find the product. Leave answer reduced to lowest terms, and assume that all variables have nonzero values.
? 
A. 
B. 
C. 
D. 