3 years ago

Please help asap anything helps

Mathematics

1 answer:

garik1379 [7]3 years ago

8 0

Answer:

1.) 2.5 meters a second

Step-by-step explanation:

1 min 12 seconds is 72 seconds. 28 meters on 72 seconds. 28×2.5=72

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What is an extraneous solution to the equation b/b-3 -5/b=3/b-3 ?

storchak [24]

$\frac{b}{b-3} - \frac{5}{b} = \frac{3}{b-3} \\ \frac{ b^{2} -5(b-3)}{b(b-3)} =\frac{b}{b-3} \\ \frac{ b^{2} -5b+15}{b^2-3b} =\frac{b}{b-3} \\ (b-3)(b^{2} -5b+15)=b(b^2-3b) \\ b^3-8b^2+30b-45=b^3-3b^2 \\ 5b^2-30b+45=0 \\ b^2-6b+9=0 \\ (b -3)(b-3)=0 \\ b=3$

To check: 3/3-3 - 5/3 = 3/0 - 5/3 which is not defined.

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2 years ago

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IgorLugansk [536]

The easiest way to find percentages of numbers is to change the percentage to a decimal and multiply it by the number.

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I hope this helps :)

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3 years ago