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timama [110]
3 years ago
11

When you sample the first individuals you can find, you call it a _____; it's cheap and easy to do, but statistically not a very

strong method.
A.
cluster
B.
stratified random sample
C.
convenience sample
D.
cluster sample
E.
simple random sample
Mathematics
1 answer:
ddd [48]3 years ago
7 0

Answer:

E.

simple random sample

Step-by-step explanation:

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eli has a square sprocket abcd graphed in a coordinate plane. the square sprocket was rotated 180 about the origin to form A'B'C
Maksim231197 [3]

Answer:

a 6,3 b 2,3 c 2,-1 d 6,-1

Step-by-step explanation:

flip the signs

6 0
3 years ago
Pleaseeee help w these math questions! please show work!!!<br><br> 50 points
Schach [20]

9. You need an exact answer. So I will give you it but I'll also give you an approximation because it might help you understand it more.

Because we know the cosine fo theta, we can evaluate the inverse cosine of -2/3 first to find theta.

sin^{-1}(-2/3) = 131.81° approx.

Because 131.81° is in the second quadrant its third quadrant partner is 228.19°. Which would make the sine 0.75 approximately.

But we need an exact answer I suppose so which is this disgusting mess...sin(2\pi -cos^{-1}(\frac{-2}{3})). I know it looks scary but it is basically  all the steps we just did but without evaluating anything.

This can be simplified using: sin(x− y) = sinxcosy−cosxsiny

To... -sin(cos^{-1}(\frac{-2}{3}))

answer: -sin(cos^{-1}(\frac{-2}{3}))

10. Okay. So because we have a point we can say that...

θ = tan^{-1}(-9/11)

sin(θ) = +sin(tan^{-1}(-9/11))

11. arcsin(-0.37) = sin^{-1}(-0.37) = -21.72°+2kπ or 201.72°+2kπ approx. where k has to be an integer

answer: idk if you want one or more solutions so I gave you them all.

12. arccos(-√3/2) = cos^{-1}(\frac{-\sqrt{3} }{2}) = \frac{5\pi }{6}+2k\pi, \frac{7\pi }{6}+2k\pi

Remember that "k" must be an integer.

answer: 5π/6

6 0
3 years ago
two trains depart Charlotte at the same time. one train heads North at 60 mph. there other train heads South at 40 mph. after 4
belka [17]

Answer:

Step-by-step explanation:

5 0
3 years ago
Plz help<br> 15 + (-8) =
Effectus [21]

Answer:

7

Step-by-step explanation:

15 + (-8)

7

The answer would be 7 because you are only taking 15 plus negative 8 which would technically be the same as taking 15 minus 8, which would be 7.

Hope this helps! Please mark as brainliest! Thanks! Let me know if you need anymore help! :D

6 0
3 years ago
I will mark you brainiest if you can answer this
Vikentia [17]
7 will never equal 8 so there is no solution. so i think it is C
3 0
3 years ago
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