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3 years ago

7

2 people can plough a field in 6 hours. A) how long will it take 1 person to plough the field. B) how long will it take 3 people

to plough the field.

2 answers:

aniked [119]3 years ago

6 0

Answer:

a) 12 hours b) 2 hours

Serga [27]3 years ago

3 0

Answer:

A= 12 hours B= 3 hours

Step-by-step explanation:

The more people that help the shorter the hours get

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2 years ago

To solve the equation 5sin(2x)=3cosx, you should rewrite it as___.

galina1969 [7]

Answer:

A

Step-by-step explanation:

We want to solve the equation:

$5\sin(2x)=3\cos(x)$

To do so, we can rewrite the equation.

Recall the double-angle for sine:

$\sin(2x)=2\sin(x)\cos(x)$

By substitution:

$5\left(2\sin(x)\cos(x)\right)=3\cos(x)$

Distribute:

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We can subtract 3cos(x) from both sides:

$10\sin(x)\cos(x)-3\cos(x)=0$

And factor:

$\cos(x)\left(10\sin(x)-3\right)=0$

Hence, our answer is A.

*It is important to note that we should not divide both sides by cos(x) to acquire 10sin(x) = 3. This is because we need to find the values of x, and one or more may result in cos(x) = 0, and we cannot divide by 0. Hence, we should subtract and then factor.

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2 years ago

Read 2 more answers