Simplify. Assume that all exponents represent natural numbers.(9x2r - xr - 1) + (x2r + 4xr + 4)
A. 10x4r + 5x2r + 5
B. 10x2r + 3xr + 3
C. 9x2r + 4xr + 4
D. 8x4r - 5x2r - 5
Answer: B
Mathematics
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Find ?f.f(x, y, z) = 
A. F = 
i + 2yj + 2zk
B. F = 
i + 
j + 
k
C. F = 
(x2 + y2 + z2)i + 
j + 
k
D. F = 
i + 
j + 
k
Mathematics
Evaluate the improper integral or state that it is divergent.
A. 4 B. Divergent C. -4 D. 0
Mathematics
Solve the problem.The table lists the amount of emissions of a certain pollutant in millions of tons.
If the amount of emissions is modeled by a function of the form 
where x is the year, estimate the amount of emissions in the year 2025.
A. 43.8 million tons B. 34.0 million tons C. 41.7 million tons D. 38.6 million tons
Mathematics
Find the intercepts for the graph of the equation.2x + y = 10
A. (0, 2); (0, 6) B. (5, 0); (0, 10) C. (10, 6); (2, 10) D. (2, 0); (6, 0)
Mathematics