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Luba_88 [7]
4 years ago
14

Prove that sin(???? + ????) = sin(????) cos(????) + sin(????) cos(????).

Mathematics
1 answer:
12345 [234]4 years ago
4 0

Answer:

What???

Step-by-step explanation:

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84 is 60% of what number?
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To convert a percent to a decimal, you divide by 100.


60% = 0.60


If x is the unknown number, the word is means equal


84 = 0.60 * x


Divide both sides by 0.60


84/0.60 = (0.60/0.60)* x = x


140 = x

5 0
3 years ago
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The points (2, r) and (6, -4) lie on a line with slope 4. Find the missing coordinate r<br> R=
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\text{The slope-intercept form:}\ y=mx+b\\\\\text{We have:}\ m=4\\\\\text{then}\ y=4x+b\\\\\text{The line passes through point (6; -4). Substitute:}\\\\(6;-4)\to x=6;\ y=-4\\\\-4=4\cdot6+b\\-4=24+b\ \ \ |-24\\b=-28\\\\\text{therefore:}\ y=4x-28
\text{substitute}\ (2;\ r)\to x=2;\ y=r\\\\r=4\cdot2-28=8-28=-20

Answer: r = -20
7 0
4 years ago
The Art department at a high school is selling a collection book of sketches created by the
lisov135 [29]

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167 books are needed to get above the minimum of 1500 dollars

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3 years ago
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Write two sets of 5 different numbers that have the same mean but different standard deviations
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Answer:

The sets could be 5, 5, 5, 5, 5 and 0, 10, 20, -10, 5

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Standard deviations are a measure of how far the average point is away from the mean. In the first example, each term is exactly the mean. In the second set, some are quite a distance from the mean and therefore, it would have a bigger standard deviation.

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