exam Maths Puzzle Numerical Ability

Please help solve the following questions from ch. 4 exersie 4.4 question# 14,34,36,62 thanks,
John
ISBN: 0-321-22757-3
Textbook title (optional): College Algebra
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exam Other Question

Find the product:
[3 -1]
0 4] [2 -1 3]
2 1] [0 -2 4]

Find the product:
[3 -7] [0 -4
[1 2] [5 -3] Eva counted her quarters and dimes. She had a total of 107 coins with a value of $17.45. How many of each type of coin did she have?