Subtract.10 - (-3.135)
A. 13.135
B. 6.865
C. -6.865
D. -13.135
Answer: A
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Determine whether the first literal expression is equal to the second literal expression.a + b, b - (-a)
A. Yes B. No
Solve the problem.A tank initially contains 100 gal of brine in which 40 lb of salt are dissolved. A brine containing 
of salt runs into the tank at the rate of 4 gal/min. The mixture is kept uniform by stirring and flows out of the tank at the rate of 3 gal/min. Find the solution to the differential equation that models the mixing process.
A. y = 2(100 + t) - 
B. y = 2(100 + t) - 
C. y = 4(50 + t) - 
D. y = 4(50 + t) - 
Solve the formula for the indicated letter. Assume that all variables represent nonnegative numbers.A = 
?r2 for r
A. r = ±3
B. r = ±
C. r = ±
D. r = ± 
Find the zeros of the function. Give exact answers.f(x) = x2 - 8x + 20
A. 6, 2 B. 4 ± 2i C. -4 ± 2i D. 8 ± 4i