Estimate the sum or difference by first rounding to the nearest ten.81
A. 130
B. 30
C. 40
D. 36
Answer: B
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Solve the problem.Mara can type 48 words per minute. How many words would she type in 
hour (30 minutes)?
A. 96 words B. 24 words C. 1440 words D. 720 words
Complete.14.6 g = 
kg
A. 0.00146 B. 14,600 C. 1460 D. 0.0146
Find the indicated roots.Square roots of 1 - i
A. 
(cos 22.5° + i sin 22.5°), 
(cos 202.5° + i sin 202.5°)
B. 
(cos 157.5° + i sin 157.5°), 
(cos 337.5° + i sin 337.5°)
C. 
(cos 22.5° + i sin 22.5°), 
(cos 22.5° + i sin 22.5°)
D. 
(cos 157.5° + i sin 157.5°), 
(cos 337.5° + i sin 337.5°)
Solve the problem.A sample of 500 g of lead-210 decays to polonium-210 according to the function given by 
where t is time in years. What is the amount of the sample, to the nearest gram, after 10 years?
A. 363 g B. 264 g C. 20 g D. 689 g