Calculate the Riemann sum 
?xi for the given data.f(x) = x + 4; P: 2 < 2.75 < 3.25 < 4.5 < 5.5; 
= 2, 
= 3, 
= 4.25, 
= 5
A. 28
B. 27.7216
C. 27.3125
D. 26.0125
Answer: C
Mathematics
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Use the known graph of y = ln x to graph the equation.y = ln 
A. 
B. 
C. 
D. 
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Draw an appropriate Venn diagram and use the given information to fill in the number of elements in each region.n(A) = 48, n(B') = 60, n(C) = 51, n(A ? B) = 20, n(B ? C) = 19, n(A ? C) = 18, 
A. 
B. 
C. 
D. 
Mathematics
Solve and check the equation. Begin your work by rewriting the equation without fractions.
- x = 
- 
A. 
B. 
C. 
D. 
Mathematics
Solve the problem.A certain radioactive isotope decays at a rate of 0.15% annually. Determine the half-life of this isotope, to the nearest year.
A. 201 yr B. 5 yr C. 462 yr D. 333 yr
Mathematics