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EleoNora [17]
3 years ago
9

Which of the following sample types should you always regard as unreliable? A) voluntary response samples 18) 9 simple random sa

mples B) stratified samples D) eluster samples 19) Statistics is the science of conducting studies to A) solve a system of equations
Mathematics
1 answer:
Inessa [10]3 years ago
4 0

Answer:

The type of sample that can be considered unreliable is type (a), in which responses are voluntary.

Step-by-step explanation:

The type of sample that can be considered unreliable is type (a), in which responses are voluntary.

It can be considered unreliable because being voluntary, the answers will give a biased result and the analysis will not be valid.

The rest of the options, if the necessary collections are taken, are samples that can be considered reliable.

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A stone is thrown upward from ground level. With what minimum speed should the stone be thrown so as to reach a height of 36 fee
rusak2 [61]
V^2 = u^2 - 2gh; where v is the final speed, u is the initial speed, g = 9.8 m/s = 0.54 ft/min is the accerelation due to gravity, h = height.
At the maximum height, the final speed is 0.
u^2 = 2gh = 2 x 0.54 x 36 = 38.58
u = sqrt(38.58) = 6.21 ft/min

Therefore, the stne should be thrown with 6.21 ft/min

4 0
3 years ago
Hey, can I please get some help with this? It shouldn’t be too hard, thanks!
Fynjy0 [20]

Answer:

  • (x -3)(x+3)(2x +1)
  • (x -1)(x +1)(x +3)
  • (2x -1)(2x +1)(x -4)

Step-by-step explanation:

A) 2x³ +x² -18x -9 = x²(2x +1) -9(2x +1) = (x² -9)(2x +1) = (x -3)(x+3)(2x +1)

__

B) x³ +3x² -x -3 = x²(x +3) -1(x +3) = (x² -1)(x +3) = (x -1)(x +1)(x +3)

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C) 4x³ -16x² -x +4 = 4x²(x -4) -1(x -4) = (4x² -1)(x -4) = (2x -1)(2x +1)(x -4)

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In each case, the third-level factoring mentioned in step 4 is the factoring of the difference of squares: a² -b² = (a -b)(a +b).

_____

The step-by-step is exactly what you need to do. It is simply a matter of following those instructions. You do have to be able to recognize the common factors of a pair of terms. That will be the GCF of the numbers and the least powers of the common variables.

7 0
3 years ago
Definition of the identity property of addition and the commutative property of addition
Novay_Z [31]
Let x, y be numbers.
The addition identity property states that 0 + x = x.
The commutative property states that x + y = y + x
6 0
4 years ago
Read 2 more answers
A
aleksandr82 [10.1K]

Answer:

x=67

y=40

The angles equal 63 and 117

Step-by-step explanation:

88% sure

5 0
3 years ago
What is 7•8+1•40. Explain your answer
zaharov [31]

Answer:

96

Step-by-step explanation:

We will use the order of operations to solve the equation

7×8+1×40

multiplication before addition, so we do this first:

7×8=56

We change the equation to this:

56+1×40

Then we multiply:

1×40=40

We change the equation to this:

56+40

Then we add to solve:

56+40=96

3 0
3 years ago
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