PLS HELP with #2 its only that one question 31 brainlys

Mathematics

1 answer:

Mamont248 [21]3 years ago

5 0

Answer:

the answer is 1

$56 in savings and $4 per week

4w + 56

Step-by-step explanation:

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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.

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3 years ago

Find the midpoint of the segment connecting (4,7) to (-2,3).

KonstantinChe [14]

If you put 2 points on a graph paper and connect them, you can find the midpoint pretty easily

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3 years ago

Consider the function f(x) = x^{2/3} on the interval [-1,8].

zhannawk [14.2K]

The right option is (c). The Mean Value Theorem does not apply since f(x) is not differentiable on (-1,8). Because the derivative of f is 2/3 x^(-1/3) which is undefined at x=0.So, that would imply that it is not differentiable along the interval.

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3 years ago

What is 5 3/5% of 750?<br><br> Thanks in advance.

GREYUIT [131]

<h3>given:</h3>

$5 \frac{3}{5} \% \: of \: 750$