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torisob [31]
3 years ago
14

PLEASE HELPPPP For a short time after a wave is created by wind, the height of the wave can be modeled using y = a sin 2πt/T, wh

ere a is the amplitude and T is the period of the wave in seconds. Write an equation for the given function given the amplitude, period, phase shift, and vertical shift. amplitude: 4, period 4 phase shift = vertical shift = -2
Mathematics
1 answer:
serg [7]3 years ago
7 0

Answer:

y= 4 sinx/2-3

Step-by-step explanation:

y= a sin2πt/T

where : a is the amplitude , t is the time in seconds, and T is a period of wave is seconds.

y=A sin (B(x+C)) +D

amplitude A = 4

2π/B is period = 4

C is the phase shift  = -2

D is vertical shifts = -2

now substitute the numbers in the equation :

y= A sin ( B(x+C)) + D

y= 4 sin (4(x-2) -2

y=4sin(4x-8)-2

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Use a number line to solve.<br> 0.03 -0.92<br> a. -0.89<br> b. -0.95<br> C. 0.95<br> d. 0.89
AfilCa [17]

Answer:

a. -0.89

Step-by-step explanation:

The easiest way to solve this is that 0.03 - 0.92 is also the same thing as -0.92 + 0.03, your answer should be -0.89 which you are adding up 0.03.

5 0
3 years ago
3 5/12 - 8/12 this is a fraction pls provide a explanation
ZanzabumX [31]
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4 0
3 years ago
What number multiplied by it's self give the product 576​
jarptica [38.1K]

Answer:

24

Step-by-step explanation:

576 root is 24

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8 0
4 years ago
Read 2 more answers
Two students in different classes took the same math test. Both students received a
ivann1987 [24]

Answer:

Both students scored in the top 10% of their classes.

Step-by-step explanation:

Normal Probability Distribution:

Problems of normal distributions can be solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the z-score of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the p-value, we get the probability that the value of the measure is greater than X.

In this question:

Top 10% = Above the 100 - 10 = 90th percentile.

The 90th percentile of scores is X when Z has a pvalue of 0.9, that is, Z = 1.28.

So, the student who had a z-score above 1.28 scored in the 90th percentile of their class.

In student A's class the mean was 78 and the standard deviation of 5. He scored 87.

We have that \mu = 78, \sigma = 5, X = 87

Then

Z = \frac{X - \mu}{\sigma}

Z = \frac{87 - 78}{5}

Z = 1.8

1.8 > 1.28, so student A scored in the top 10% of his/her class.

Student B's class the mean was 76 with a standard deviation of 4. Scored 87.

We have that \mu = 76, \sigma = 4, X = 87

Then

Z = \frac{X - \mu}{\sigma}

Z = \frac{87 - 76}{4}

Z = 2.75

2.75 > 1.28, so student B also scored in the top 10% of his/her class.

Both students scored in the top 10% of their classes.

8 0
3 years ago
5.Find the coordinate of point Y such that the ratio of CY to YE is 1:1.
dexar [7]

Step-by-step explanation:

does that mean you understand all the other questions but not 5. ?

that is strange, as this seems to be the easiest one of all the 6 questions.

to be sure, let's have a look at all 6.

1.

the distance MJ = 18 - 2 = 16

MX / XJ = 3/1

the ratio talkes about 3+1 = 4 basic units.

as the whole distance is 16, one such basic ratio unit is 16/4 = 4.

that means from M to X we have 3 of these basic ratio units, and from X to J the remaining 1 of the basic ratio units.

so, MX = 3×4 = 12

since M = 2, X = 2 + 12 = 14

2.

similar to 1.

just now

MY / YJ = 2/3

so, the ratio uses 2+3 = 5 basic units.

that means 1 basic unit is 16/5 = 3.2

2 basic units = 2 × 3.2 = 6.4

3 basic units = 3 × 3.2 = 9.6

so, MY = 6.4

since M = 2, Y = 2 + 6.4 = 8.4

3.

the distance A F = 5 - -7 = 5 + 7 = 12

AW / WF = 1/3

so, the ratio uses 1+3 = 4 basic units.

1 basic unit is 12/4 = 3

3 basic units is 3 × 3 = 9

so, AW = 3

since A = -7, W = -7 + 3 = -4

4.

the distance BF = 5 - -5 = 5 + 5 = 10

BX / XF = 3/2

so, the ratio uses 3+2 = 5 basic units.

1 basic unit = 10/5 = 2

2 basic units = 2 × 2 = 4

3 basic units = 3 × 2 = 6

so, BX = 6

since B = -5, X = -5 + 6 = 1

5.

the distance CE = 2 - -4 = 2 + 4 = 6

CY / YE = 1/1

so, the ratio uses 1+1 = 2 basic units.

1 basic unit = 6/2 = 3

so, CY = 3

since C = -4. Y = -4 + 3 = -1

6.

attention : this goes in the other direction than the other questions. all the others were looking from a point on the left to a point on the right.

but this one looks from a point on the right to a point on the left.

but the same principles apply.

the distance FD = |1 - 5| = |-4| = 4

a distance is always positive, so for this direction we need to apply the absolute value (formality we did that also for the other direction in the other questions, but there it was not necessary to use it explicitly) .

FZ / ZD = 5/3

so, the ratio uses 5+3 = 8 basic units.

1 basic unit = 4/8 = 0.5

3 basic units = 3 × 0.5 = 1.5

5 basic units = 5 × 0.5 = 2.5

so, FZ = 2.5

since F = 5, Z = 5 - 2.5 = 2.5

this is where the other direction really hits : since we have to go to the smaller side, we have to subtract the distance from the original coordinate (instead of the usual addition).

7 0
2 years ago
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