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DiKsa [7]
3 years ago
9

Prove whether or not 169 is a perfect square.

Mathematics
1 answer:
Olegator [25]3 years ago
6 0
Because 13 * 13 = 169
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What inverse operation is used to solve the equation? x 2 = 10
Alla [95]

Answer:

5

Step-by-step explanation:

? x 2 = 10

     /2     /2

? =5

6 0
3 years ago
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If 5<2x+3<11, what is the possible range of value of -4x-6
Lady bird [3.3K]

Answer:

-10 > (-4x - 6) > -22

Step-by-step explanation:

Given inequality is 5 < 2x + 3 < 11

Now we will multiply this inequality by (-2) resulting,

5(-2) > (2x + 3)(-2) > 11(-2)

-10 > (-4x - 6) > -22 (Sign of inequality gets reversed when the inequality is multiplied or divided by a negative number)

Therefore, the possible range of (-4x - 6) is between -22 and -10.

4 0
3 years ago
Work out 27 ÷ 9 + 9 <br> Work out 4 + 5 x 3<br> Work out -9 + -4<br> ) Work out 9 - -5
san4es73 [151]

Answer:

1. 27/9=3+9=12

2. 4+5x3=5x3=15+4=19

3. -9+-4=-13

4. 9--5=14

7 0
3 years ago
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The U.S. Energy Information Administration (US EIA) reported that the average price for a gallon of regular gasoline is $3.94 (U
tekilochka [14]

Answer:

a) 25

b) 49

c) 97

Step-by-step explanation:

The sample size is calculated using the formula, n = (\frac{\sigma\times z}{\textup{Margin of error}})^2

Now,

for 95% confidence level value of z-factor = 1.96

Given:

Mean = $3.94

standard deviation = $0.25

thus,

a) for margin of error = $0.10

n = (\frac{\sigma\times z}{\textup{Margin of error}})^2

or

n = (\frac{0.25\times1.96}{\textup{0.10}})^2

or

n = 4.9²

or

n = 24.01 ≈ 25               (Rounded off to next integer)

b) for margin of error = $0.07

n = (\frac{\sigma\times z}{\textup{Margin of error}})^2

or

n = (\frac{0.25\times1.96}{\textup{0.07}})^2

or

n = 7²

or

n = 49

c) for margin of error = $0.05

n = (\frac{\sigma\times z}{\textup{Margin of error}})^2

or

n = (\frac{0.25\times1.96}{\textup{0.05}})^2

or

n = 9.8²

or

n = 96.04 ≈ 97               (Rounded off to next integer)

6 0
3 years ago
Estimate the area of a polygon. A) 8 cm2 B) 10 cm2 C) 12 cm2 D) 14 cm2
Debora [2.8K]
The question is impossible to answer. as we do not have the image of the polygon
6 0
3 years ago
Read 2 more answers
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