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11Alexandr11 [23.1K]
3 years ago
9

An aquarium is being filled at a rate of 2.5 inches per second. The equation y=2.5x is used to determine the height of the water

after x seconds. Find the domain and range of the situation if it takes 60 seconds to fill the aquarium
Mathematics
1 answer:
goldenfox [79]3 years ago
7 0

Answer:

  • domain: 0 ≤ x ≤ 60
  • range: 0 ≤ y ≤ 150

Step-by-step explanation:

The reasonable domain of the function is the time range over which it is applicable: 0 to 60 seconds. The function will not give appropriate answers after the time that the aquarium is full.

The reasonable range of the function is the set of values corresponding to the reasonable domain: 0 to 2.5×60 = 150 (inches).

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7nadin3 [17]

Answer: z(e) = 2.07

Step-by-step explanation:

1.-The problem is about a test of proportions. As research company claims than no more 55 % of Americans regularly watch Fox News

The null hypothesis is  H₀       P₀ ≤ 0.55       from 55%

And the alternative hypothesis is  Hₐ      Pₐ > .55

Is one tail test

2.-We have to specify significance level we assume our test will be for a significance level α = 5%  or α = 0,05

3.-Calculation of z (c) = ??  and z (e) = '??

For z (c) we find in z table the value of  z(c) = 1.64

For z (e) = ( P -P₀)/√p₀q₀/n     z(e) = 0.05 / √(0.55*0,45)/425                         z(e) = 0,05/ 0.02413    z(e) = 2.07

z(e) > z(c)  threfore z(e) is in the rejection zone . We reject null hyothesis

4 0
4 years ago
A line segment whose endpoints are (2,6) and (8,y) is perpendicular to a line whose slope is -4. What is the value of y?
Mariulka [41]
If the line segment is perpendicular to a line with the slope of -4, that means the line segment has a slope of 1/4.

First let's make an equation for the line segment using the slope of 1/4 and the point at (2,6) to find the final piece, the y-intercept

y = mx + b
6 = 1/4(2) + b
6 = 2/4 + b
24/4 = 2/4 + b
22/4 = b

y = 1/4 x + 22/4
6 = 1/4(2) + 22/4
6 = 2/4 + 22/4
6 = 24/4
6 = 6 <-- proves that this equation is correct

Now you may plug in the x to find y. ( 8 , y )
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4 0
3 years ago
during the week of the country fair, fifteen thousand, six hundred nine entry tickets were sold. Is it correct to write the numb
dezoksy [38]

Answer:

No. It's 15,609

Step-by-step explanation:

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The six hundred is 600

The nine is 9.

So it is 15,609

4 0
3 years ago
Find the solution set for this equation x^2-36=0
nadezda [96]
      here............................                                                                              

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Wendy is standing 60 feet away from a tree. Her eyes are 5 feet above the ground. She sees a bird hovering above a tree. The ang
andreev551 [17]

Answer:

a) The tree is 32.98 feet  tall.

b) The bird is 50.21 feet high in the air.

c) The Bird is 17.23 feet far above the Tree.

Step-by-step explanation:

From the attached diagram, please familiarize yourself with the statement drawn out and the points drawn out for better understanding.

Note that Line CD is the ground level and Line QE is the Wendy's eyes height.

1) <em>How tall is the tree</em> (Line BC)

line BC (tree height) => QC + QB

Line ED = QC,  ∴ QC = <em>5 ft</em>

Since <BEQ = 25° and CD = QE, ∴ QE = 60ft all in triangle BEQ

Therefore Tan 25° = BQ/60

BQ = 60 (0.4663)

BQ = <em>27.98 ft</em>

tree height => QC + QB = 5 ft + 27.98 ft ==> 32.98 ft

2) <em>How high is the bird in the air?</em> (Line AC)

line AC (bird height) => QC + QA

Line ED = QC,  ∴ QC = <em>5 ft</em>

Since <AEQ = 37° and CD = QE, ∴ QE = 60ft in triangle AEQ

Therefore Tan 37° = QA/60

QA = 60 (0.7536)

QA = <em>45.21 ft</em>

bird height => QC + QA = 5 ft + 45.21 ft ==> 50.21 ft

3) <em>How far above the tree is the bird?</em>

The difference between the bird height and the tree height = Line AC - Line BC

= 50.21 ft - 32.98 ft

= 17.23 ft

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