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Anon25 [30]
2 years ago
10

Please help me..asap

Mathematics
1 answer:
Ivenika [448]2 years ago
6 0

Answer:

D

the first one obviously isnt random
the second one is selective then random
the third one is also selective
the fourth one is random

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If f(x) varies directly with x2, and f(x) = 96 when x = 4, find the value of f(2).
Scilla [17]
F ( x ) = k * x²
f ( 4 ) = 96
96 = k * 4²
96 = 16 k
k = 96 : 16
k = 6
f ( 2 ) = 6 * 2² = 6 * 4 = 24
Answer: D ) 24
6 0
3 years ago
Read 2 more answers
A citrus farmer wants to know which of three fertilizers (A, B, and C) is most effective for increasing the number of oranges on
Lyrx [107]

<u>Description</u><u> </u><u>of</u><u> </u><u>a</u><u> </u><u>Randomized</u><u> </u><u>block design</u><u> </u><u>for</u><u> </u><u>the</u><u> </u><u>experiment</u><u> </u><u>:</u>

Randomized block design involved the divison of subjects into units, called block. After which treatment are randomly applied to elements or subjects in each block.

Here, we make divide the 30 mature trees into 3 which means we have <em>3 blocks of 10 mature</em> trees each. The citrus <em>fertilizers A, B and C</em> are then applied randomly to each of the three units.

B.)

The randomized block design used in these experiments will correct for the possible error which could be introduced die to systematic error since each of the treatments(fertilizers A, B and C) would be used in each of the blocks.

Learn more :brainly.com/question/18405415

6 0
3 years ago
Jordan’s family went to dinner and bought four meals for $8.00 each. They had a coupon for 25% off. What was their total bill af
il63 [147K]

Answer:

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Step-by-step explanation:

6 0
3 years ago
The top one please, HELP!!
Rainbow [258]
A is the correct answer
6 0
3 years ago
Please please helpplpplpol
tresset_1 [31]

Answer: -4/5

Step-by-step explanation:

Ok so cos(x) = -4/5 and we know that:

sin^2(x) + cos^2(x) = 1.

If we plug that in and solve for sin(x) we get:

sin^2(x) = \frac{9}{25} \\sin(x) = \frac{3}{5}

Now we have to consider: <em>is sin(x) positive or negative?</em>

We have that \pi  < x < \frac{3\pi }{2}.

From the unit circle, we know that sin(x) is negative in this range. Therefore sin(x) actually equals -3/5.

But the question asks: <em>what is sin(x + \frac{\pi }{2})?</em>

Here's where another important equation comes in:

sin(\alpha  + \beta ) = sin(\alpha)cos(\beta) + cos(\alpha)sin(\beta)

In this case, we have alpha = x and beta = pi/2.

So, that looks like:

sin(x + pi/2 )= sin(x)cos(pi/2) + cos(x)sin(pi/2)

We already have what sin(x) and cos(x) are. We also know that sin( pi/2) = 1 and cos(pi/2) = 0.

sin(x  + pi/2 ) = (-3/5)(0) + (-4/5)(1).

Therefore we simply have

sin(x + pi/2) = -4/5

7 0
3 years ago
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