Simplify the expression.3431/3
A. ±7
B. 19
C. 7
D. 49
Answer: C
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Find decimal notation.75%
A. 0.75 B. 7.5 C. 0.075 D. 0.64
Solve the problem.If x is the hydrogen ion concentration of a sample of water, then the pH of that water sample is 
If the pH of the water from one lake is 7.5 and the pH of the water from a second lake is 8.4, how many times greater is the hydrogen ion concentration of the second lake than the hydrogen ion concentration of the first lake? Round your answer to the nearest hundredth.
A. 7.81 B. 0.13 C. 13.18 D. 7.94
Use the product-to-sum identities to rewrite the expression as the sum or difference of two functions.cos 6? cos 5?
A. 
cos 11? - 
sin ?
B. 
cos 11? - 
cos ?
C. cos2 30?2
D. 
cos ? + 
cos 11?
Solve the problem.Barges from ports X and Y went to cities A and B. X sent 32 barges and Y sent 8. City A received 22 barges and B received 18. Shipping costs $220 from X to A, $300 from X to B, $400 from Y to A, and $180 from Y to B. $9280 was spent. How many barges went where?
A. 16 from X to A; 16 from X to B; 6 from Y to A; 2 from Y to B B. 18 from X to A; 18 from X to B; 4 from Y to A; 4 from Y to B C. 20 from X to A; 12 from X to B; 2 from Y to A; 6 from Y to B D. 22 from X to A; 10 from X to B; 0 from Y to A; 8 from Y to B