Chapter 11: Q. 25 (page 783)
Graph each system of linear inequalities by hand. Verify your results using a graphing utility.
Short Answer
The required solution is

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Chapter 11: Q. 25 (page 783)
Graph each system of linear inequalities by hand. Verify your results using a graphing utility.
The required solution is

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In Problems , use a graphing utility to solve each system of equations. Express the solution(s) rounded to two decimal places.
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If Bruce and Bryce work together for hour and minutes, they will finish a certain job. If Bryce and Marty work together for hour and minutes, the same job can be finished. If Marty and Bruce work together, they can complete this job in hours and minutes. How long will it take each of them working alone to finish the job?
Cryptography; One method of encryption is to use a matrix to encrypt the message and then use the corresponding inverse matrix to decode the message. The encrypted matrix, , is obtained by multiplying the message matrix, , by a key matrix, . The original message can be retrieved by multiplying the encrypted matrix by the inverse of the key matrix. That is, and .
(a) Given the key matrix , find its inverse, . [Note: This key matrix is known as the Fibonacci encryption matrix.]
(b) Use your result from part (a) to decode the encrypted matrix
(c) Each entry in your result for part (b) represents the position of a letter in the English alphabet (and so on). What is the original message?
A doctor’s prescription calls for a daily intake containing 40 milligrams (mg) of vitamin C and 30 mg of vitamin D. Your pharmacy stocks two liquids that can be used: one contains 20% vitamin C and 30% vitamin D, the other 40% vitamin C and 20% vitamin D. How many milligrams of each compound should be mixed to fill the prescription?
The sum of two numbers is , and the difference of their
squares is . Find the numbers.
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