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20- The answer is 20.Five years ago, Amy was three times as old as Mike. Mike is 10 years now. Therefore, 5 years ago Mike was 5 years.Five years ago, Amy was: \(A=3×5=15\)Now Amy is 20 years old: \(15 + 5 = 20\) 21- Choice D is correct\(\begin{cases}\frac{-x}{2}+\frac{y}{4}=1\\\frac{-5y}{6}+2x=4\end{cases}\)Multiply the top equation by 4. Then,\(\begin{cases}-2x+y=4\\\frac{-5y}{6}+2x=4\end{cases}\)→ Add […]
C. D. 6- In the rectangle below if \(y>5\) cm and the area of rectangle is 50 \(cm^2\) and the perimeter of the rectangle is 30 cm, what is the value of \(x\) and \(y\) respectively? A. 4, 11 B. 5, 11 C. 5, 10 D. 4, 10 7- Right triangle ABC has two legs […]
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