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2 years ago

I really need help pleaseeee

Mathematics

1 answer:

raketka [301]2 years ago

4 0

12.92 I hope this helps

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Dave can complete a sales route by himself in 4 hours. James can do the same job in 5 hours. How long will it take them to do it

Alexeev081 [22]

We can solve this problem by calculating the individual rate of working and equate it to their total rate of working.

If Dave can complete a sales route in 4 hours, then his working rate is

$\frac{1}{4}$

Also, if James can do it in 5 hours, then his working rate is

$\frac{1}{5}$

Let
$x$
be the hours that both will use to complete the sales route,

Then rate at which both completes this task is
$\frac{1}{x}$

Meaning if we add their individual rates we should get

$\frac{1}{x}$

That is;

$\frac{1}{4} + \frac{1}{5} = \frac{1}{x}$

The LCM is
$20x$

So let us multiply through with the LCM.

$20x \times \frac{1}{4} + 20x \times \frac{1}{5} =20x \times \frac{1}{x}$

$5x + 4x = 20$

We simplify to get,

$9x = 20$

Dividing through by 9 gives;

$x = \frac{20}{9}$

$x = 2\frac{1}{9}$

Therefore the two will complete sales route in
$2 \frac{1}{9}$
hours.

3 0

3 years ago

Which choice is equivalent to the expression below?

Mars2501 [29]

There is no picture or expression

4 0

4 years ago

7x-y=-10 (linear combination)<br> -7x+5y=-6

andreyandreev [35.5K]

(-2,-4) is the correct answer.

Hope this helps:)

5 0

3 years ago

Can anyone please help with this??

Crazy boy [7]

:Answer:

You may want to use an online graphing calculator to help with this problem. :)

3 0

4 years ago

HELP ASAP WHAT IS THIS ANSWER

postnew [5]

Answer:

Step-by-step explanation:

x = 1/2 ( a + b)

x = 1/2 (129 + 71)

x = 1/2 (200)

x = 100 °

you just have to remember that formula

7 0

3 years ago