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fgiga [73]
3 years ago
5

How do we know the angle of 45 degrees is always equal to the square root of 2 over 2?

Mathematics
1 answer:
stellarik [79]3 years ago
8 0
The question is not correct, you mean the the sine and cosine of 45 degrees is always square root 2 over 2. 

Well you need to know how the sine and cosine are calculated. I would search in google for "sine and cosine in a unit circle". There is a very good Khan academy video that explains this in 10 minutes. Watch and learn :-)
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Plz help meeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
Eva8 [605]
I think the answer is C.

First start by factoring, you should get (2n-3)(n-2)=0

Then start to solve for n.

2n-3=0

n-2=0

n=2, n= 3/2

I hope that helps.
7 0
3 years ago
The average speed to go by car from home to college is 30 miles per hour. The average speed to go back home from college is 20 m
Levart [38]

Answer:

24 mph for both 60 miles and 40 miles.

Step-by-step explanation:

We need to find how long it takes to get to college and from it.

Speed x time (x) = Distance (60)

30x = 60

x=2

It takes two hours to get to college

20x = 60

x = 3

It takes 3 hours to get back. It's a total of 5 hours, 2 hours at 30mph and 3 at 20. Now we need to find the average

30+30+20+20+20=120

120/5= 24

The average speed for the round trip is 24.

To do the second part, we follow the same process, but replace 60 with 40 for distance.

30x=40

x= 1.33

20x=40

x=2

We can add the total distance and divide by total time to find the average.

The total distance is 80. Time is 3.33

80/3.33=24

The average speed is still 24.

3 0
3 years ago
Write the equation of a circle with center (7.0) with radius 3.
harina [27]

Answer:

2.3

Step-by-step explanation:

so the 7.0 gets dived by the 3 because the radius is half of the circle.

5 0
3 years ago
Read 2 more answers
Find the area of the shaded region
dsp73

Answer:

4

Step-by-step explanation:

I am not 100% sure but I really hope this helps you.

6 0
2 years ago
Cole has already taken 7 quizzes during past quarters, and he expects to have 1 quiz during each week of this quarter. Write an
san4es73 [151]

Answer:

y = x + 7

Step-by-step explanation:

x = number of weeks

y = the total number of quizzes y.

<em>Cole has already taken 7 quizzes = </em>+ 7

<em>he expects to have 1 quiz during each week of this quarter = </em>1x

y = 1x + 7

y = x + 7

7 0
3 years ago
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