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3 years ago

Help please WILL GIVE BRAINLIEST TO RIGHT ANSWER!

Mathematics

2 answers:

erica [24]3 years ago

7 0

D

jandjandiqbabjaneba

Tcecarenko [31]3 years ago

4 0

Answer:

I think A is the answer

but D is the correct answer "kunno"

Step-by-step explanation:

hope it helps :)

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Help!! plz help to solve!

artcher [175]

You can solve all of these by using the distance formula. I have shared it below.

4 0

3 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:

$16(x+9)+22x=3x(x+9)$

Simplifying it we get

$3x^{2}-11x-144=0$

Solve the quadratic equation using formula

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

putting a=3 , b= -11, c= -144

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

WILL GIVE BRAINLIEST!!!!!!!!!!!!! Which of the following shows the length of the third side, in inches, of the triangle below?

Dmitriy789 [7]

<span>By the Pythagorean theorem:

</span> $third \ side = \sqrt{74^2-24^2} = \sqrt{5476-576}= \sqrt{4900}=70 \ in$ <span>
</span>

4 0

3 years ago

Read 2 more answers

your phone says that 14.5% is equivalent to the decimal 14.5 explain why your friend is incorrect by comparing the fraction -14.

Lelechka [254]

A percent is a proportion of something that can come from a variety of different numbers depending on what you are measuring. 14.5% is not the same as 14.5 because the 14.5% isn’t necessarily 14.5 of a certain amount. For example, $14.50 of the $100 you have could be from your grandparents; making 14.5% of your money from your grandparents but a deposit of $145 into a bank account that already has $855 would mean that 14.5% of the money in that bank account was from that deposit but $145 does not equal $14.50. They just have the same proportion just different on different scales.

Hope this is what you were looking for.

4 0

3 years ago

Verify that the given value is the solustion of the equation x=6 for 2z-4=8

klemol [59]

Answer:

8-4=2z.. 2z+4=6 so x=6

6 0

3 years ago

Help please WILL GIVE BRAINLIEST TO RIGHT ANSWER!​

Help please WILL GIVE BRAINLIEST TO RIGHT ANSWER!