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rjkz [21]
3 years ago
15

Five years ago a girl was one-half as old as her brother was then, and now she is three years younger than he is. What are their

present ages?
A) girl is 7; brother is 10

B) girl is 8; brother is 11

C) girl is 9; brother is 12
Mathematics
2 answers:
podryga [215]3 years ago
7 0
The girl is 8 and her brother is 11


Aloiza [94]3 years ago
3 0
The answer is B because they would have been 3 and 6.
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Answer:

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Step-by-step explanation:

\text{We have}:\\\\f(x)=x^2-4\ \text{and}\ g(x)=x^2+2x\\\\(f-g)(x)=f(x)-g(x)\\\\\text{therefore}\\\\(f-g)(x)=(x^2-4)-(x^2+2x)=x^2-4-x^2-2x\\\\=(x^2-x^2)-2x-4=-2x-4\\\\(f-g)\left(-\dfrac{1}{3}\right)\to\text{put}\ x=-\dfrac{1}{3}\ \text{to the equation of the function}\ (f-g)(x):\\\\(f-g)\left(-\dfrac{1}{3}\right)=-2\left(-\dfrac{1}{3}\right)-4=\dfrac{2}{3}-4=-3\dfrac{1}{3}

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3 years ago
Plz help fifty points
likoan [24]

Answer:

for question 13

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  5. 130
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Step-by-step explanation:

for 14

    x. 150

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2 years ago
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