Solve the problem.At a plant that packages bottled spring water, the water is passed through a sequence of ion-exchange filters to reduce the sodium content prior to bottling. Each filter removes 68% of the sodium present in the water passing through it. Determine the number of filters that must be used to reduce the sodium concentration from 16 parts-per-million to 1.58 parts-per-million.
A. 7 filters
B. 9 filters
C. 6 filters
D. 8 filters
Answer: C
Mathematics
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Perform the operation and give the answer in Hindu-Arabic form. src="https://sciemce.com/media/4/ppg__ttt0612191108__f1q184g6.jpg" alt="" style="vertical-align: 0.0px;" height="13" width="10" />
A. 3111
B. 1131
C. 1311
D. 1113
+ 
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Use an Euler diagram to determine whether the argument is valid or invalid.Some cars are considered sporty.Some cars are safe at high speeds.Some sports cars are safe at high speeds.
A. Valid B. Invalid
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Simplify.133 × 122 + (12 - 7) × 6
A. 316,398 B. 3,796,446 C. 316,482 D. 966
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Find the exact value of the expression.sin 20° cos 100° + cos 20° sin 100°
A. 
B. 
C. - 
D. - 
Mathematics