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3 years ago

What is the surface area of a sphere with a diameter of 14 cm?

Mathematics

1 answer:

umka2103 [35]3 years ago

7 0

Answer:

A ≈ 615.75 cm squared

or 616cm squared when rounded off

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Paul wants to compare whether the prices of tangerines in two supermarkets differ significantly. He has been noting down the dai

Wewaii [24]

<span>Based on the rules of statistics</span>

68% of the data falls within 1 standard deviation of the mean

95% of the data falls within 2 standard deviation of the mean

99% of the data falls within 3 standard deviation of the mean

20 falls between the range of -56 to 56 (from the given 95%)

Hence we accept the null hypothesis; else, if the mean falls outside the range, we reject the null hypothesis.

5 0

2 years ago

What is the difference

Advocard [28]

Answer:

what is question of this you asked

3 0

2 years ago

What is the answer for cos(43) = sin(?)

oee [108]

Answer:

Step-by-step explanation:

cos 43=cos (90-47)=sin 47

6 0

2 years ago

The price of a video game was reduced from $60 to $45. By what percentage was the price of the video game reduced?* O 15% O 25%

Naya [18.7K]

Answer:

Step-by-step explanation:

The new price, $45, can be expressed as a percentage of $60 by taking it as a fraction of $60, converting to a decimal value, and multiplying by 100%. $45/$60=3/4=0.75, 0.75x100%=75%. So since 100%-75%=25%, the value was reduced by 25%.

5 0

3 years ago

Problem1 The behavior of a physical system can be described by the following first order differential equation: dy/dt=2y +t^2

daser333 [38]

Answer:

$y = \dfrac{t^3e^{2t}}{3}+Ce^{2t}$ .

Step-by-step explanation:

Using first order linear differential equation:

$\dfrac{\mathrm{d} y}{\mathrm{d} t} = 2y + t^2$

$\frac{\mathrm{d} y}{\mathrm{d} t} - 2y =t^2$

finding integrating factor:

I.F = $e^{\int -2dt}$

I.F = $e^{-2t}$

now,

$y = \dfrac{1}{IF}(\int t^2dt+ c )$

$y = \dfrac{1}{e^{-2t}}(\int t^2dt+ c )$

$y = \dfrac{t^3e^{2t}}{3}+Ce^{2t}$

hence the solution is

$y = \dfrac{t^3e^{2t}}{3}+Ce^{2t}$

8 0

3 years ago