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Aleonysh [2.5K]
3 years ago
15

Can to answer all 4 please?

Mathematics
1 answer:
Tasya [4]3 years ago
5 0
1) A - yes, b - no, c -  yes
2) false, true, false
3) 85p - 34%
      xp - 66%
x = 165 - she has to read 165 more pages.
4) Sylvia earns 84/12 = 7$/hr
maximum she can earn is 7*15 = 105 $
she will earn 105$ if she works for 15 hours
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What are the solutions of x^2-2x+37=0?
blsea [12.9K]

Answer:

Answer is x=1+6i x=1-6i

Step-by-step explanation:

3 0
3 years ago
Please solve the table and show your work
Elanso [62]

Answer:

a

Step-by-step explanation:

3 0
2 years ago
You are visiting a rainforest, but unfortunately,your insect repellent has run out. As a result, at each second, a mosquito land
zmey [24]

Answer:

Step-by-step explanation:

Prob at each second, a mosquito lands on your neck =0.5

Prob it bites/it lands = 0.2

Prob it does not bite/it lands = 0.8

Hence in one second prob for getting a bite = 0.5(0.2) = 0.01

i.e. 1/100 chance of getting bitten in one second

In 100 seconds number of bites =1

Expected time between successive bites = 100

6 0
3 years ago
Simplify the following expression.
Jobisdone [24]

An expression is defined as a set of numbers, variables, and mathematical operations. The given exponential function when simplified will result in 4^(1/8). The correct option is A.

<h3>What is an Expression?</h3>

In mathematics, an expression is defined as a set of numbers, variables, and mathematical operations formed according to rules dependent on the context.

The given exponential expression can be simplified as shown below.

(4^{\frac14})^{\frac12}

Using the exponential property (mᵇ)ˣ = mᵇˣ,

= 4^{\frac14 \times \frac12}

= 4^{\frac18}

Hence, the given exponential expression when simplified will result in 4^(1/8).

Learn more about Expression here:

brainly.com/question/13947055

#SPJ1

8 0
11 months ago
Read 2 more answers
A simple random sample from a population with a normal distribution of 98 body temperatures has x =98.90 °F and s =0.68°F. Const
Ludmilka [50]

Answer:

0.609 \leq \sigma \leq 0.772  

And the best conclusion would be:

D. This conclusion is safe because 1.40 °F is outside the confidence interval.

Step-by-step explanation:

1) Data given and notation  

s=0.68 represent the sample standard deviation  

\bar x =98.90 represent the sample mean  

n=98 the sample size  

Confidence=90% or 0.90  

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 .  

2) Calculating the confidence interval  

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

\frac{(n-1)s^2}{\chi^2_{\alpha/2}} \leq \sigma^2 \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=98-1=97  

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.  

The excel commands would be: "=CHISQ.INV(0.05,97)" "=CHISQ.INV(0.95,97)". so for this case the critical values are:  

\chi^2_{\alpha/2}=120.990  

\chi^2_{1- \alpha/2}=75.282  

And replacing into the formula for the interval we got:  

\frac{(97)(0.68)^2}{120.990} \leq \sigma \leq \frac{(97)(0.68)^2}{75.282}  

0.371 \leq \sigma^2 \leq 0.596  

Now we just take square root on both sides of the interval and we got:  

0.609 \leq \sigma \leq 0.772  

And the best conclusion would be:

D. This conclusion is safe because 1.40 °F is outside the confidence interval.

3 0
3 years ago
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