Choose the best answer.The area of a lake is about
A. 2 km2
B. 2 cm2
C. 2 m2
D. 2 dm2
Answer: A
Mathematics
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Evaluate.4x, for x = 5
A. 54 B. 9 C. 45 D. 20
Mathematics
Simplify.
A. 1
B. 1 - a2
C. 
D. 
Mathematics
Find all solutions to the equation.cos x = - 
(Express your answer in radians, in exact form.)
A. 
B. 
C. 
D. 
Mathematics
Solve.If a person puts 1 cent in a piggy bank on the first day, 2 cents on the second day, 3 cents on the third day, and so forth, how much money will be in the bank after 40 days?
A. $8.20 B. $4.10 C. $16.40 D. $0.40
Mathematics