Algebra II Chapter 4 rev sheet KEY

Algebra II Chapter 4 rev sheet KEY - the inverse matrix...

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Algebra II Chapter 4 Review sheet Name: _____________ Period: _________ You will need a graphing calculator for this exam. 1) - - - = 3 2 1 3 2 1 A - - = 1 4 1 2 3 1 0 5 B (a) Find the products AB and BA if they exist. 1(a) AB = BA = (b) Find the sum A + B . 1(b) ___________________ 2) Find the inverse of each matrix (a) = 2 10 5 25 U 2(a) ____________________ (b) - = 1 3 2 6 F 2(b) __________________ (c) - = 3 1 5 3 W 2(c)__________________ 3) Solve the following system using the inverse matrix method by hand ( You must show all your work. And remember to write your answer in the correct form. ) = + = + 6 4 3 5 5 2 y x y x 3) ______________________
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4) Solve the following system using the inverse matrix method and a graphing calculator. Round your answers to the nearest hundredth. ( Please show the matrices you entered into the calculator and remember to write your answer in the correct form .) = + - = - 16 4 5 . 0 35 7 5 . 2 y x y x 4) _____________________ 5) Solve the following system using
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Unformatted text preview: the inverse matrix method and a graphing calculator. Round your answers to the nearest hundredth. ( Please show the matrices you entered into the calculator and remember to write your answer in the correct form .) -=-= + = + 6 . 7 7 2 4 2 8 . 8 z y z x y x 5) ___________________ 6) A 600-seat theater charges $13 for adults and $11.50 for children. If all seats were filled and the total ticket income was $7648.50, how many adults were in the audience? (Write your answer as a complete sentence) 6) ______________________ ________________________ Solve the following word problem. Please write your answer as a complete sentence. 7) A collection of nickels, dimes, and quarters totals $7.05. If there are 49 coins altogether and five more nickels than dimes, how many quarters are there? 7) ______________________ ________________________...
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