Express the sum in sigma notation.2 + 3 + 4 + 5 + 6 + 7
A. 
k
B. 
C. 
D. 
+ 2
Answer: B
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Find the difference.-44 - 44
A. -88 B. -132 C. 88 D. 0
Solve the problem.The pH of a solution ranges from 0 to 14. An acid has a pH less than 7. Pure water is neutral and has a pH of 7. The pH of a solution is given by 
where x represents the concentration of the hydrogen ions in the solution in moles per liter. Find the hydrogen ion concentration if the 
A. 3.98 × 10-2 B. 2.51 × 10-2 C. 2.51 × 10-3 D. 3.98 × 10-3
Find 
using implicit differentiation.
?
?
A. 
B. ?
C. ?
D. ?
E. ?
Solve the problem.A retired couple has $130,000 to invest to obtain annual income. They want some of it invested in safe Certificates of Deposit yielding 5%. The rest they want to invest in AA bonds yielding 12% per year. How much should they invest in each to realize exactly $12,100 per year?
A. $80,000 at 12% and $50,000 at 5% B. $90,000 at 12% and $40,000 at 5% C. $80,000 at 5% and $50,000 at 12% D. $70,000 at 5% and $60,000 at 12%