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2 years ago

If tan x = , and 0 < x < , what is cos(x – 3x)?

Mathematics

1 answer:

sweet-ann [11.9K]2 years ago

6 0

Answer:cos ( − 2 x )

Step-by-step explanation: Subtract 3 x from x .

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Find vector c if c=a+b (view image) A. 7,6 B. -7,2 C. 0,-5 D. -5, 0

o-na [289]

Answer:

$\vec c=$

Option B

Step-by-step explanation:

Sum of vectors in $\mathbb{R}^2$

Given two vectors $\vec a=$ and $\vec b=$ . The sum of both vectors is:

$\vec a+\vec b =$

The vectors in the figure are

$\vec a=$

$\vec b=$

The sum is

$\vec c=\vec a+\vec b =$

$\vec c=$

Option B

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2 years ago

What is the midpoint between (-8, 5) and (2, -2)?

liraira [26]

The midpoint is (-6,2)

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3 years ago

Read 2 more answers

A store sold 1800 bags in 1985 and 1500 bags in 1986. If they averaged selling 2100 bags per year through 1987, how many

iris [78.8K]

Answer:

3000 bags

Step-by-step explanation:

In this case we must apply the formula of the mean, which would be the sum of the values divided by the amount of data is the mean:

m = (a1 + a2 ... an) / n

In this case we know the mean, we must know the 1987 data, therefore:

Let x be the number of bags sold in 1987, replacing in the previous equation:

2100 = (1800 + 1500 + x) / 3

2100 * 3 = 3300 + x

x = 6300 - 3300

x = 3000

Therefore, for the average to be a total of 2100 bags in those 3 years, the amount of bag sold in 1987 must have been 3000 bags

8 0

2 years ago

A scientist wants to find the average mass of fish living in a large pond. So she will use the masses of a sample of fish from t

Oxana [17]

The scientist would use milligrams, grams, and kilograms.

The best procedure would be to randomly pick 52 fish from the entire pond and weigh each of them as this would be the most unbiased way to achieve the average mass

6 0

2 years ago

The line with equation a + 4b = 0 coincides with the terminal side of an angle θ in standard position and cos θ>0 . What is t

Nikitich [7]

Answer:

$\frac{-1}{\sqrt{17} }$

Step-by-step explanation

We have given that equation of line a+4b=0

⇒4b= -a

⇒ $b= \frac{-a}{4}$

slope of line = $tan\theta =\frac{P}{B}= \frac{-1}{4}$

⇒ $tan\theta$ is negative therefore it lies into 4th quadrant

By, Pythagoras theorem $H^2=P^2+B^2$

by putting value of P= -1 & B=4

the value of $H=\sqrt{17}$

with the given condition $cos\theta>0$

i.e. $\theta$ ∈ (3π/2, 2π)

now, $sin\theta= \frac{P}{H}= \frac{-1}{\sqrt{17}}$

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2 years ago