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4 years ago

Help quick !!!!!!!!!!!!!!

Mathematics

2 answers:

ser-zykov [4K]4 years ago

7 0

(7×5)+(7×9)

7×(5+9)=98

(7×5)+(7×9)=35+63=98

vfiekz [6]4 years ago

5 0

Answer: the correct answer is ( 7 * 5 ) + (7 * 9 )

Step-by-step explanation:

7 * ( 5+9) = (7 * __) + ( 7 * __) = ( 7 * 5 ) + (7 * 9 )

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De una lamina rectangular de 10 centímetros de ancho y 14 de largo se construye una caja abierta, cortando un cuadrado de x cent

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3 years ago

Whiskers the cat weighs 2 and 2 over 3 kg.piglio weighs 4 kg. How many times as heavy as piglio is whiskers

ruslelena [56]

Answer:

Whiskers is two-third times as heavy as piglio is.

Step-by-step explanation:

Given:

Weight of whiskers is, $W=2\frac{2}{3}\ kg$

Weight of piglio is, $P=4\ kg$

In order to compare their weights, we have to divide both the weights and then express one weight in terms of the other.

Therefore, dividing whiskers weight by piglio's weight, we get:

$\frac{W}{P}=2\frac{2}{3}\div 4\\\frac{W}{P}=\frac{8}{3}\div \frac{4}{1}(\textrm{4 can be rewritten as 4/1 in fraction form})$

Now, when we divide two fractions, we replace the division sign by multiplication and reverse the second fraction. This gives,

$\frac{W}{P}=\frac{8}{3}\times \frac{1}{4}\\\frac{W}{P}=\frac{8\times 1}{3\times 4}\\\frac{W}{P}=\frac{2}{3}$

Now, expressing 'W' in terms of 'P', we multiply both sides by 'P. This gives,

$W=\frac{2}{3}P$

Therefore, the weight of whiskers is two-third times as heavy as piglio is.

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3 years ago

What is the solution for x in the equation?

Sveta_85 [38]

Answer:

Step-by-step explanation:

combine like terms (so 1/2 and 3/2): 2 - x = x - 4

add x to both sides: 2 = 2x - 4

add 4 to both sides: 6 = 2x

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3 years ago

Which expression is equivalent to the following complex fraction?

Mamont248 [21]

i hope this will help :)

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4 years ago

Read 2 more answers

Because of staffing decisions, managers of the Gibson-Marimont Hotel are interested in the variability in the number of rooms oc

Anit [1.1K]

Answer:

a) $\hat \sigma^2 =s^2 =30^2 = 900$

b) $567.277 \leq \sigma^2 \leq 1690.224$

Rounded to the nearest number would be:

$567 \leq \sigma^2 \leq 1690$

c) $23.818 \leq \sigma \leq 41.112$

And rounded :

$23.8 \leq \sigma \leq 41.1$

Step-by-step explanation:

Data given and notation

s=30 represent the sample standard deviation

$\bar x=290$ represent the sample mean

n=20 the sample size

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population mean or variance lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

The Chi Square distribution is the distribution of the sum of squared standard normal deviates .

Part a

The best point of estimate for the population variance is the sample variance, so on this case:

$\hat \sigma^2 =s^2 =30^2 = 900$

Part b

The confidence interval for the population variance is given by the following formula:

$\frac{(n-1)s^2}{\chi^2_{\alpha/2}} \leq \sigma \leq \frac{(n-1)s^2}{\chi^2_{1-\alpha/2}}$

The next step would be calculate the critical values. First we need to calculate the degrees of freedom given by:

$df=n-1=20-1=19$

Since the Confidence is 0.90 or 90%, the value of $\alpha=0.1$ and $\alpha/2 =0.05$ , and we can use excel, a calculator or a table to find the critical values.