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vovikov84 [41]
3 years ago
13

Which expression is equivalent to (x Superscript one-half Baseline y Superscript negative one-fourth Baseline z) Superscript neg

ative 2? StartFraction x Superscript one-half baseline Over y z squared EndFraction StartFraction x Superscript one-half baseline Over y Superscript one-fourth Baseline z squared EndFraction StartFraction y Superscript one-half Baseline Over x z squared EndFraction
Mathematics
1 answer:
lana66690 [7]3 years ago
8 0

Answer:

\frac{x^{\frac{1}{2}}}{y^{\frac{1}{4}}z^2}

Step-by-step explanation:

Given

x^{\frac{1}{2}}y^{-\frac{1}{4}}z^{-2}

Required

Find the equivalent

To find the equivalent of the given expression; we have to apply laws of indices;

As a law;

a^{-m} = \frac{1}{a^m}

So; the expression x^{\frac{1}{2}}y^{-\frac{1}{4}}z^{-2} becomes

x^{\frac{1}{2}}*\frac{1}{y^{\frac{1}{4}}}*\frac{1}{z^2}

This is further simplified to

x^{\frac{1}{2}}*\frac{1}{y^{\frac{1}{4}} * z^2}

x^{\frac{1}{2}}*\frac{1}{y^{\frac{1}{4}}z^2}

Combine to form a single fraction

\frac{x^{\frac{1}{2}}*1}{y^{\frac{1}{4}}z^2}

Multiply numerator

\frac{x^{\frac{1}{2}}}{y^{\frac{1}{4}}z^2}

The expression can not be further simplified

Hence x^{\frac{1}{2}}y^{-\frac{1}{4}}z^{-2} is equivalent to \frac{x^{\frac{1}{2}}}{y^{\frac{1}{4}}z^2}

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Write an equation of the line passing through the point (7, 3) that is parallel to the line 4x - 7y=9
lina2011 [118]

Answer:

y = 4/7x - 1

Step-by-step explanation:

7y = 4x - 9

y = 4/7x - 9/7

3 = 4/7(7) + b

3 = 4 + b

b = -1

8 0
3 years ago
If Tom, George and Mario work together, they can paint a 600 ft2 room in 4 hours. When only George and Mario work together, it t
WINSTONCH [101]
We call:

T = Tom's paiting rate ( \frac{ ft^{2} }{h} )
G = George's paiting rate ( \frac{ ft^{2} }{h} )
M = Mario's paiting rate ( \frac{ ft^{2} }{h} )

As the first statement says that they can work together, then:

T + G + M = Painting rate working together, that is the surface area they paint per hour.

Since the problem says that they last four hours painting a 600ft^{2} room, then we need to multiply the amount of hours times the painting rate that is equal the surface area of the room, so:

4(T + G + M) = 600

Applying a similar reasoning, the George and Mario's painting rate is:

0 + G + M 
Note that 0 implies that Tom didn't work in this case.

As they last eight hours painting the room, then:

8(0 + G + M) = 600

The same reasoning is applied to Tom and George working together. In this case 0 implies that Mario didn't work, so:

6(T + G + 0) = 600

We have a system of linear equations in three variables T, G, M:

<span>4(T+G+M)=600
8(0+G+M)=600
6(T+G+0)=600
</span>
Solving:

(1) T + G + M = 150
(2) G + M = 75
(3) T + G = 100

Substitute (3) in (1):
100 + M = 150 ∴ M = 50

Replace M in (2):
G + 50 = 75 ∴ G = 25

Substitute G in (3)
T + 25 = 100 ∴ T = 75

Then, the painting rates are:
Tom = 75 ( \frac{ ft^{2} }{h} )
George = 25 ( \frac{ ft^{2} }{h} )
Mario = 50 ( \frac{ ft^{2} }{h} )

<span>Solving for Time to determine how long it would take Tom to paint the room alone:
</span>
<span>Painted Area = Painting Rate×Time, so:

</span>Time Tom =  \frac{Painted Area}{Painting Rate (T)}
Time Tom = \frac{600}{75} = 8 hours
6 0
3 years ago
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Anit [1.1K]

Answer:

Snowball Sampling

Step-by-step explanation:

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Answer: B.

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7 0
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