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4 years ago

Verify cos(180+x)=-cosx Please note the 180 is in degrees.

1 answer:

5 0

The angle sum identity for cosine says that

$\cos(180^\circ+x)=\cos180^\circ\cos x-\sin180^\circ\sin x=-\cos x$

because $\cos180^\circ=-1$ and $\sin180^\circ=0$ .

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How can we simplify the expression -(1-5n)-7n

dsp73

$-(1-5n)-7n \\ \\ -1 + 5n - 7n \\ \\ -1 - 2n \\ \\ Answer: \fbox {-1 - 2n}$

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3 years ago

Hi. can you help me?

PIT_PIT [208]

Answer:

Sure

Step-by-step explanation:

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3 years ago

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A scientist wanted to measure the constant rate of the current in a particular section of the river. She released a tracker into

alukav5142 [94]

Answer:

1.486m/s

Step-by-step explanation:

The rate of change is defined as the change in distance divided by the change in time

Rate = ∆distance/∆time

Distance = 16.5 and 5.5

Time = 10.9 and 3.5

When we put this into the formula above, we have:

Rate of change = 16.5 - 5.5 / 10.9 - 3.5

= 11/7.4

= 1.486m/s

The constant rate of change has been calculated to be equal to 1.486m/s

8 0

3 years ago

Evaluate 1+(-2/3)-(-m)where m = 9/2

slava [35]

Answer:

29/6

Step-by-step explanation:

The expression that we have to evaluate in this problem is

$1+(-\frac{2}{3}) -(-m)$

for $m=\frac{9}{2}$ .

First of all, we re-arrange the expression. We know that:

- The product of a positive number (+) and a negative number (-) is negative (-)

- The product of a negative number (-) and a negative number (-) is positive (+)

So we can rewrite the expression as

$1-\frac{2}{3}+m$

Also, we can combine the two numerical terms:

$1-\frac{2}{3}=\frac{3}{3}-\frac{2}{3}=\frac{1}{3}$

Therefore the expression becomes

$\frac{1}{3}+m$

Now we can substitute $m=\frac{9}{2}$ , and we find:

$\frac{1}{3}+\frac{9}{2}=\\\frac{2}{6}+\frac{27}{6}=\\\frac{2+27}{6}=\frac{29}{6}$

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4 years ago

Write 100/100 in the simplest form

bogdanovich [222]

100/100 ---> 50/50 ---------> 25/25 -----------> 5/5

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3 years ago

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