Example 2 Hair Growth Human hair grows about 0.7 centimeter in 2 weeks. How long does hair take to grow 14 centimeters? Writing and Solving a Proportion.

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Example 2 Hair Growth Human hair grows about 0.7 centimeter in 2 weeks. How long does hair take to grow 14 centimeters? Writing and Solving a Proportion x0.7 = 142 Cross products property 0.7x = 28 Multiply x = Divide each side by 0.7. SOLUTION x 14 = Length of hair grown Number of weeks

Example 2 Writing and Solving a Proportion x = 40 Simplify. ANSWER Hair takes about 40 weeks to grow 14 centimeters.

ANSWER 7 72 ANSWER 42 ANSWER 270 Use the cross products property to solve the proportion. Checkpoint 5. = t = z p = b 9 =