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Olenka [21]
3 years ago
6

What does x times x equal

Mathematics
1 answer:
Lorico [155]3 years ago
5 0

Answer: x squared

Step-by-step explanation: x times x would be x squared

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In a random sample of 400 residents of Boston, 320 residents indicated that they voted for Obama in the last presidential electi
coldgirl [10]

Answer:

C.I =  0.7608   ≤ p ≤   0.8392

Step-by-step explanation:

Given that:

Let consider a  random sample n = 400 candidates where  320 residents indicated that they voted for Obama

probability \hat p = \dfrac{320}{400}

= 0.8

Level of significance ∝ = 100 -95%

= 5%

= 0.05

The objective is to  develop a 95% confidence interval estimate for the proportion of all Boston residents who voted for Obama.

The confidence internal can be computed as:

=\hat p  \pm Z_{\alpha/2} \sqrt{\dfrac{ p(1-p)}{n } }

where;

Z_{0.05/2} = Z_{0.025} = 1.960

SO;

=0.8  \pm 1.960 \sqrt{\dfrac{ 0.8(1-0.8)}{400 } }

=0.8  \pm 1.960 \sqrt{\dfrac{ 0.8(0.2)}{400 } }

=0.8  \pm 1.960 \sqrt{\dfrac{ 0.16}{400 } }

=0.8  \pm 1.960 \sqrt{4 \times 10^{-4}}

=0.8  \pm 1.960 \times 0.02}

=0.8  \pm 0.0392

= 0.8 - 0.0392     OR   0.8 + 0.0392  

= 0.7608    OR    0.8392

Thus; C.I =  0.7608   ≤ p ≤   0.8392

3 0
3 years ago
Divide. (334)÷(−212) Enter your answer as a mixed number, in simplified form, in the box.
Mandarinka [93]

Answer:

-1.575, or -1 575/1000, or -1 23/40

Step-by-step explanation:

Simplify the problem slightly by prefacing it with " - " as follows:

    334

- ----------- = -1.575  =  -1 23/40

     212

3 0
3 years ago
Read 2 more answers
Write an equation that you can use to find the value of x.
MariettaO [177]
Line CA is a straight line, meaning it adds up to 180°

Line BE splits the line into two supplementary angles, because when the two angles are added together they will equal 180°

Using the rule of supplementary angles, we can then make the equation 3x + 8x + 15 = 180

Now, simplify the equation by combining like terms

11x + 15 = 180

To solve, isolate x

11x + 15 = 180
11x = 165
x = 15
7 0
2 years ago
2x+3y=6<br> 3x-y=2<br> How many solutions does this have, one, none or infinite
sergey [27]
Y=-2/3x + 2
y=3x-2

one because the slopes are different

6 0
3 years ago
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Please help me guys please
madam [21]

parallel when a=2

perpendicular when a=-1/2

3 0
3 years ago
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