I think it’s A for some reason
7x+5y=-24 (1)
4x+y=42 (2)
multiply equation (2) by 5 to get
20x+5y=210 (3)
then calculate (3)-(2) which gives you
13x=234 hence x=18
then substitute for x in either equation to get y=-30
The books are $5, and the magazines are $10. I’m not sure which way you want it explained but since magazines are twice the price of books, you can solve the equation 3b + 2b = 25. This gives you b=5 which you just multiply by 2 giving you the price of a magazine.
D), I believe it is -42. Correct me if im wrong :}
The answer is: " 5.3 in. " .
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Note:
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√(28 in²) = (√28) in = 5.2915026221291812 in = 5.3 in.
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