Solve.-5a + 4 + 6a = 11 - 23
A. 38
B. 16
C. -16
D. -38
Answer: C
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Research done in the 1930s by the French physiologist Jean Poiseuille showed that the resistance R of a blood vessel of length l and radius r is 
, where k is a constant. Suppose a dose of the drug TPA increases r by 20%. How will this affect the resistance R? Assume that l is constant.
?
It will drop by __________%.
Fill in the blank(s) with the appropriate word(s).
Solve the system of linear equations.
x + 
y = 4
x - 2y = 21
A. (6, -8)
B. (-6, 8)
C. No solutions
D. 
Solve.
= 
+ 
A. 
B. {24}
C. 
D. 
Solve the problem.After being in business for t years, a manufacturer of radios is making 
units per year. The sales price in dollars per unit is calculated by using the formula 
Write a formula for the manufacturer's yearly revenue R(t) after t years.
A. R(t) = 
B. R(t) = (1500 + 400t + 30t2) - (30 + 3t)
C. R(t) = (1500 + 400t + 30t2) + (30 + 3t)
D. R(t) = (1500 + 400t + 30t2)(30 + 3t)