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CHECKPOINT Mathematical Functions

# CHECKPOINT Mathematical Functions - 33.3 9 Convert 1/5 to a...

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CHECKPOINT (Mathematical Functions) 1. Solve the equation for x to determine how many mL of 3% solution you need. × = 3 100 2 3x100=300, 2xx =300, x=150 2. Convert 3% to a decimal. .03 3. Convert 2% to a fraction. 100 2 = 50 1 4. Percents are often used to show the strength of solutions. Which solution is stronger, the 2% or the 3%? 3% 5. What does 3% of sodium chloride mean? It means that the active ingredient sodium chloride is 3% of the solution. 6. Referring to the proportion regarding NaCl in the scenario, show the product of the means equals the product of the extremes. 3:150=1:150 150x1=150 (means), 3x50=150 (extremes) 7. Convert 12% to a fraction. 25 4 100 12 = 8. What percent of 15 ounces is 5 ounces?
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Unformatted text preview: 33.3% 9. Convert 1/5 to a percent. 20% 10. Convert 33% to a decimal. .33 • Complete the following exercises: 1. Critical Thinking, p. 25: Problem 3 x=20, .5:x=3:12, 5x12=60, 3xx =60, x=20 2. Explain whether or not 20:25 = 4:5 is a true portion. Refer to Example 2 on p. 22. yes it is true, 5x20=100 & 4x25=100 so they are equal and proportioned Stop and Review, p. 22: Problems • 1a x=62.5=62 2 1 25x15=375, 6xx =375, 375÷6=62.5 • 1c x=10.8=10 10 8 18x3=54, 5xx =54, 54÷5=10.8 • 1f x=16 128x4=512, 32xx =512, 512÷32=16 • 1h x=26.66 .4x8=3.2, .12xx =3.2, 3.2÷.12=26.66 • 1l x=7.5 20x15=300, 40xx =300, 300÷40=7.5...
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