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mart [117]
3 years ago
13

Which expressions are equivalent to StartFraction 1 Over 81 EndFraction? Check all that apply.

Mathematics
1 answer:
Anastaziya [24]3 years ago
7 0

The options are

(A)8^{-1} (B)9^{-2} (C)\dfrac{9^8}{9^4}  (D)\frac{9^8}{9^{10}}  (E)9^{-6}\cdot 9^3 (F)9^5 \cdot 9^{-7

Answer:

(B)9^{-2} \\ (D)\frac{9^8}{9^{10}} \\ (F)9^5 \cdot 9^{-7

Step-by-step explanation:

Given the fraction \dfrac{1}{81}

\dfrac{1}{81}=\dfrac{1}{9^2}=9^{-2

Any option that gives a form equivalent to any of the above is valid.

Option B= 9^{-2} which is equivalent

In Option D: \frac{9^8}{9^10}=9^{8-10}=9^{-2}

In Option F: 9^5 \cdot 9^{-7}=9^{5-7}=9^{-2}

Therefore, Options B, D and F are equivalent.

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The mean of the data is given

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The variance of the data is given
( \frac{245^{2}+300^{2}+325^{2}+465^{2}+100^{2}} {5})-(287^{2})96375- 287^{2} =14006
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4 years ago
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Zeke ran 4 miles in 45 minutes. if he keeps up the same pace, how long will it take him to run 10 miles?
tresset_1 [31]
(45/4)*10 = 112.5 minutes

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The area of a rectangle is 12x^2 - 29x + 15. The width is 4x-3. What is the length of the rectangle.
allochka39001 [22]

Answer:

Step by step explanation :

Given:

it is given that in a rectangle the area is is 12x^2 -29x + 15

and the width is 4x- 3

Solution :

The rest is given in pic.

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3 years ago
Increase £120 by 35%
Natalka [10]

Answer:

£162

Step-by-step explanation:

Let's first find 35% of £120.

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Super simple!

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3 years ago
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Here is a flower made up of yellow hexagons, red trapezoids, and green triangles.
Law Incorporation [45]

Answer: Part a) You could build 5 copies of the flower pattern  

Part b) You would have 40 red trapezoids left over

Step-by-step explanation:

The complete question in the attached figure

Part a)

Let

x -----> the number of yellow hexagons

y ----> the number of red trapezoids

z ----> the number of green triangles

we know that

The flower pattern has the following ratios

\frac{x}{y}=\frac{6}{2} ----\frac{x}{y}=3 ---- \text {equation A}

\frac{x}{z}=\frac{6}{9} --\frac{x}{z}=\frac{2}{3} -- \text {equation B}

\frac{y}{z}=\frac{2}{9} ------ \text {equation C}

Find out how many copies of this flower pattern could you build if you had 30 yellow hexagons,50 red trapezoids, and 60 green triangles

1) For x=30

Divide 30 by 6 (remember that in one pattern there are 6 yellow hexagons)

30/6=5\ copies

Verify the quantity of y needed and the quantity of z needed

Find the value of y

\frac{30}{y}=3 ----y=30/3=10\\

10 < 50 ----> is ok

Find the value of z

\frac{30}{z}=\frac{2}{3} --- z=30*3/2=45

45<60 --->is ok

2) For y=50

Divide 50 by 2 (remember that in one pattern there are 2 red trapezoids)

50/2=25\ copies

Verify the quantity of x needed and the quantity of z needed

Find the value of x

\frac{x}{50}=3 ----x=50*3=150

150 > 30 ----> is not ok

3) For z=60

Divide 60 by 9 (remember that in one pattern there are 9 green triangles)

60/9=6.7 copies

Round down

6 copies -----> 6(9)=54 green triangles

Verify the quantity of x needed and the quantity of y needed

Find the value of x

\frac{x}{54}=\frac{2}{3} --- z=54*2/3=36

36> 30 --->is not ok

therefore

You could build 5 copies of the flower pattern

Part b)

we know that

x:y:z=6:2:9

If you build 5 copies

1) You would use 5*6=30 yellow hexagons and you would have 0 hexagons left over

2) You would use 5*2=10 red trapezoids and you would have (50-10=40) trapezoids left over

3) You would use 5*9=45 green triangles and you would have (60-45=15) triangles left over

therefore

You would have 40 red trapezoids left over

3 0
4 years ago
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