Solve the problem.Alex and Juana went on a 100-mile canoe trip with their class. On the first day they traveled 19 miles. What percent of the total distance did they canoe?
A. 5%
B. 500%
C. 19%
D. 0.19%
Answer: C
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Use the rules for exponents to rewrite the expression and then evaluate the new expression. 3-2? 34
A. 
B. 6
C. -729
D. 9
Solve the problem.In most societies, men say they prefer women who are younger. In country A, the preferred age in a mate for men is 16
years younger than self. In country B, the preferred age in a mate for men is 8
years younger than self. What is the difference between the preferred age in a mate for men in country A and men in country B?
A. 24
yr
B. 7
yr
C. 23
yr
D. 7
yr
Solve the problem.Find the hydrogen ion concentration of a solution whose pH is 6.1. Use the formula 
A. 0.78532984 B. 1.26 × 106 C. 7.94 × 10-7 D. -0.7853298
Find the exact value of the expression.cos 
cos 
- sin 
sin 
A. 0
B. 1
C. -1
D. 