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never [62]
3 years ago
14

What is the answer ?

Mathematics
1 answer:
mina [271]3 years ago
3 0

Answer:

1)x=15

2)x=38

3)x=7

4)x=10

Step-by-step explanation:

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Pachacha [2.7K]
These two problems are equivalent
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2 years ago
Jean runs 8 mi and then rides 11 mi on her bicycle on a biathlon. She rides 9 mph faster than she runs. If the total time for he
Ipatiy [6.2K]

Let Jean's speed while running = x mph

Then Jean's speed while riding will be = x+9 mph

Distance covered by running = 8 miles

Distance covered by riding = 11 miles

Total time taken to complete the race = 1.5 hours

As, time=\frac{distance}{speed}

So, time for running= \frac{8}{x}

And time for riding= \frac{11}{x+9}

Equation becomes:

\frac{8}{x}+\frac{11}{x+9}=1.5

Now, multiply every term by 2x(x+9) to clear denominators:  

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Simplifying it we get

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Solve the quadratic equation using formula

x= \frac{-b+\sqrt{b^{2}-4ac }}{2a}

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we get (x - 9)(3x + 16) = 0

where x=9 and x=\frac{-16}{3}

Neglect the negative answer as speed cannot be negative, so x = 9 mph

Hence, Jean's running speed is 9 mph and riding speed is x+9 = 9+9 = 18 mph

4 0
3 years ago
I’m stuck... any one able to help?<br> X^4 + 5x^3 + 3x/x
Leni [432]

Answer:

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Step-by-step explanation:

1) divide each term in the numerator by the term in denominator:

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so

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hope this helps!

6 0
2 years ago
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Well I think it is 3.14
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Simplify:(-<br> 17)^8÷(-17)^2
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The simplified answer is -17^6\\

If you are dividing powers with like terms you subtract the denominator to the numerator.

\frac{-17^8}{-17^2} = -17^6

8 0
3 years ago
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