Brian can run 5 km in 18.4 minutes. If he keeps on running at the same speed, how far can he run in 23 minutes?

1 answer:

3 0

First you need to find how far he can run in one minute. To do that divide 18.4 by 5. I got 3.68.
Then, multiply that by 23 to see how far he can run in 23 minutes. I got 84.64

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3 years ago

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tensa zangetsu [6.8K]

Answer:

$5x+2 , 2x^2+5x-2,\frac{x^2+5x}{2-x^2}$

Step-by-step explanation:

We are given f(x) and g(x)

1. (f+g)(x)

(f+g)(x) = f(x) + g(x)

= $x^2+5x+2-x^2$

= $5x+2$

Domain : All real numbers as it there exists a value of (f+g)(x) f every x .

2. (f-g)(x)

(f-g)(x) = f(x)-g(x)

= $x^2+5x-2+x^2$

= $2x^2+5x-2$

Domain : All real numbers as it there exists a value of (f-g)(x) f every x .

Part 3 .

$(\frac{f}{g})(x)\\(\frac{f}{g})(x) = \frac{f(x)}{g(x)}\\=\frac{x^2+5x}{2-x^2}$

Domain : In this case we see that the function is not defined for values of x for which the denominator becomes 0 or less than zero . Hence only those values of x are defined for which

$2-x^2>0$