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2 years ago

What’s the answer?!!!!!!

Mathematics

2 answers:

Sergio [31]2 years ago

7 0

Answer:

Step-by-step explanation:

Using the converse of Pythagoras' identity.

If the square of the longest side is equal to the sum of the squares of the other 2 sides then the triangle is right.

longest side = 30 , then 30² = 900

20² + 23² = 400 + 529 = 929 ≠ 900

Then the triangle is not right.

kogti [31]2 years ago

7 0

Answer:

Step-by-step explanation:

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Help me please i really need this done I'm giving up all my points for this

Alexxandr [17]

Answer:Which question is it on all of them?

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Step-by-step explanation:

3 0

2 years ago

A sphere has a radius of 7 millimeters. A second sphere has a radius of 4 millimeters. What is the difference of the volumes of

sattari [20]

The difference would be 371 1/3

3 0

2 years ago

Katy is 1m 18 cm tall. Beth is 112 cm tall How much taller is Katy

Sergio [31]

Answer:

Katy is 6 cm taller.

Step-by-step explanation:

Katy: 1 meter=100cm

100cm+18cm=118cm

Beth: 112cm

118cm-112cm=6cm

6 0

2 years ago

How do you solve <br> 1-cos2x/cosx •cscx=tanx

astra-53 [7]

(1-cos^2x/cosx)*cosecx
(sin^2x/cosx)*sinx (where 1-cos^2x=sin^2x) and 1/cscx=sinx

sinx/cosx=tanx(divide by sinx)
hence proved

6 0

2 years ago

The authors of a paper describe an experiment to evaluate the effect of using a cell phone on reaction time. Subjects were asked

Serggg [28]

Answer:

a) The 99% confidence interval would be given by (24.409;24.979)

b) n=464

Step-by-step explanation:

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 means 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.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

Part a

The confidence interval for the mean is given by the following formula:

$\bar X \pm t_{\alpha/2}\frac{s}{\sqrt{n}}$ (1)

In order to calculate the critical value $t_{\alpha/2}$ we need to find first the degrees of freedom, given by:

$df=n-1=47-1=46$

Since the Confidence is 0.95 or 95%, the value of $\alpha=0.05$ and $\alpha/2 =0.025$ , and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=-T.INV(0.025,46)".And we see that $t_{\alpha/2}=2.01$