15. You bought a magazine for $2 and some candy bars for $5 each. You spent a total of $12. How

Mathematics

2 answers:

mart [117]2 years ago

6 0

Answer: 2 candy bars

Step-by-step explanation:

shutvik [7]2 years ago

3 0

Answer:

2 candy bars

Step-by-step explanation:

2x+5x=12

so easy way to look at this is using 1 for 2

because you bought A magazine which is 1

2(1)+5x=12

2+5x=12

we know 2+5 is 7 so lets try 2!

2+5(2)=12

2+10=12

12=12

And there you go!

The answer is 2

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Marco purchased a large box of comic books for $300. He gave 15 of the comic books to his brother and then sold the rest on an i

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$\Rightarrow 1.50=\dfrac{330}{x-15}-\dfrac{300}{x}\\\\\Rightarrow\ 1.50=\dfrac{330(x)-300(x-15)}{x(x-15)}\\\\\Rightarrow\ 1.50=\dfrac{330x-300x+4500}{x^2-15x}\\\\\Rightarrow\ 1.50(x^2-15x)=30x+4500\\\\\Rightarrow\ 1.50x^2-22.5x=30x+4500\\\\\Rightarrow\ 1.50x^2-52.5x-4500=0\\\\\Rightarrow\ 1.50x^2-52.5x-4500=0\\\\\Rightarrow\ x^2-25x-3000=0\ \ [\text{divide by 1.5}]$