
Concept explainers
(a)
Find the zero of this function.
(a)

Answer to Problem 44PPS
t=8 Minutes
Explanation of Solution
Given:
Chemical hair straightening makes curly hair straight and smooth. The percent of the process left to complete is modeled by p=−12.5t+100 , where t is the time in minutes that the solution is left on the hair, and p represents the percent of process left to complete.
Concept Used:
Calculation:
Find the zero of this function:
p=−12.5t+1000=−12.5t+100 [ plug in p = 0 ]0+12.5t = −12.5 t +12.5t +100 [ Add 12.5t to both sides ] 12.5t=10012.5t12.5 = 10012.5 [ Divide each side by 12.5 ] t=8
Thus, zero of the function t = 8 minutes.
(b)
Graph the situation.
(b)

Explanation of Solution
Given:
Chemical hair straightening makes curly hair straight and smooth. The percent of the process left to complete is modeled by p=−12.5t+100 , where t is the time in minutes that the solution is left on the hair, and p represents the percent of process left to complete.
Concept Used:
To graph the situation, Make a table of the equation p=−12.5t+100 by taking some random value t and calculate the corresponding value of p. Plot the points on the grid and join the points to make a linear graph.
Calculation:
Make a graph of this function.
Table | p=−12.5t+100 |
t p=−12.5t+100 p (t,p) 0 p = −12.5 · 0 +100p=100 100 (0,100) 8 p = −12.5 · 8 +100p=−100+100=0 0 (8,0) | ![]() |
(c)
Explain what the zero represent in this contest.
(c)

Answer to Problem 44PPS
After 8 minutes the total Chemical hair straightening process will complete.
Explanation of Solution
Given:
Chemical hair straightening makes curly hair straight and smooth. The percent of the process left to complete is modeled by p=−12.5t+100 , where t is the time in minutes that the solution is left on the hair, and p represents the percent of process left to complete.
Concept Used:
After 8 minutes the total Chemical hair straightening process will complete.
Thus, after 8 minutes the total Chemical hair straightening process will complete.
(d)
State the possible domain and range of this function.
(d)

Answer to Problem 44PPS
Domain: − ∞<t<∞ or (− ∞, ∞) and Range: − ∞<p<∞ or (− ∞, ∞)
Explanation of Solution
Given:
Chemical hair straightening makes curly hair straight and smooth. The percent of the process left to complete is modeled by p=−12.5t+100 , where t is the time in minutes that the solution is left on the hair, and p represents the percent of process left to complete.
Concept Used:
Domain and range both are all real numbers.
Calculation:
Domain: − ∞<t<∞ or (− ∞, ∞)
Range: − ∞<p<∞ or (− ∞, ∞)
Thus, Domain: − ∞<t<∞ or (− ∞, ∞) and Range: − ∞<p<∞ or (− ∞, ∞)
Chapter 3 Solutions
Algebra 1
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Elementary Statistics (13th Edition)
Algebra and Trigonometry (6th Edition)
Elementary Statistics: Picturing the World (7th Edition)
A First Course in Probability (10th Edition)
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