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3 years ago

Find the product. the coefficient of the product of (-5xy^2) and (-4x^2y) is

Mathematics

2 answers:

Art [367]3 years ago

8 0

$(-5xy^2)(-4x^2y)=5xy^2\times4x^2y=20x^1y^2x^2y^1=20x^{1+2}y^{2+1}=20x^3y^3$

Lady bird [3.3K]3 years ago

6 0

The answer is 20x^3 y^3

I hope this helps!!

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In a survey of sleeping habits, 8400 adults were selected randomly and contacted by telephone. Based on a medical association's

Andreas93 [3]

Answer:

d. None of the above.

Step-by-step explanation:

a. By the law of large numbers, it would again be 46%.

FALSE. This proportion (46%) is a sample statistic, that can or can not be repeated in another sample.

b. By the law of large numbers, the smaller (second) survey will certainly produce a sample proportion farther from the true population proportion than the larger (first) survey.

FALSE. Smaller samples will produce wider confidence intervals for the estimation of the population proportion, but larger samples does not necessarily gives us better point estimations of the true proportion. A small sample can be closer to the true proportion than a large sample, although is less probable.

c. The proportion computed from the sample of 5000 people would be more accurate because smaller samples tend to be more homogeneous than larger samples.

FALSE. There is no evidence to claim that smaller samples are more homogeneous.

d. None of the above. TRUE

6 0

3 years ago

The U.S. Energy Information Administration claimed that U.S. residential customers used an average of 10,608 kilowatt hours (kWh

Marat540 [252]

Answer:

The calculated value Z = 1.4460 < 1.96 at 0.05 level of significance.

The null hypothesis is accepted

A local power company believes that residents in their area use more electricity on average than EIA's reported average

Step-by-step explanation:

Step(i):-

Given that the mean of the Population = 10,608 kWh of electricity this year.

Given that the size of the sample n = 187

Given that mean of sample x⁻ = 10737 kWh

The Standard deviation of the Population = 1220kWh

Level of significance = 0.05

The critical value (Z₀.₀₅)= 1.96

Step(ii):-

Null Hypothesis: H₀:μ > 10608 kWh

Alternative Hypothesis: H₁: μ < 10608kWh

Test statistic

$Z = \frac{x^{-}-mean }{\frac{S.D}{\sqrt{n} } }$

$Z = \frac{10737- 10608 }{\frac{1220}{\sqrt{187} } }$

Z = 1.4460

Final answer:-

The calculated value Z = 1.4460 < 1.96 at 0.05 level of significance.

The null hypothesis is accepted

A local power company believes that residents in their area use more electricity on average than EIA's reported average.

3 0

3 years ago

Expand. Your answer should be a polynomial in standard form. (- 2h + 9)(9h - 2) = (9h - 2) =

SVETLANKA909090 [29]

Answer:18h^2+85h-18

Step-by-step explanation:

4 0

3 years ago

PLZ HELP PLZ RIGHT NOW!!

Step2247 [10]

Answer:

Table 3 and Table 5

Step-by-step explanation:

y = 3/5 x

The slope is 3/5

3/5 = .6

We want a slope that is lower

We want to find the slope for each table

Slope is found by

m = (y2-y1)/(x2-x1)

Table 1

= (12-4)/(9-3) = 8/6 = 4/3 =1.33

Table 2

= (12-4)/(15-5) = 8/10 = 4/5=.8

Table 3

= (54-18)/(93-31) = 36/62=18/31=.58

Table 4

= (33-11)/(54-18) = 22/36 = 11/12=.92

Table 5

= (21-7)/(36-12) =14/24 = 7/12 =.58

3 0

3 years ago

11 out of 25 as a percentage

Rama09 [41]

You calculate it like this: first you make a fraction: 11 divided by 25 .Then you multiply it by a 100 % (100 % is 1 so you can always multiply by it):
$\frac{11}{25} *100%$

simplifying:
$11*4%=44%$

so the answer is 44%

5 0

4 years ago

Read 2 more answers