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3 years ago

Select the correct answer.

Mathematics

1 answer:

Vikki [24]3 years ago

3 0

Answer:

the answer is A. 3225

Step-by-step explanation:

S₃₀ = 30/2 [ 2 x 6 + (30 - 1) x 7 ]

15 [ 12 + 29 x 7 ]

15 [ 12 + 203 ]

15 x 215

=3225

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Go step by step to reduce the radical. V240 Ovi try You must answer all questions above in order to submit.

Stolb23 [73]

Reducing the radical, we'll get:

$\sqrt[]{240}\rightarrow\sqrt[]{16\cdot15}\rightarrow\sqrt[]{16}\cdot\sqrt[]{15}\rightarrow4\text{ }\sqrt[]{15}$

The answer is:

$4\text{ }\sqrt[]{15}$

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1 year ago

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natulia [17]

A) 1 is greater
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4 years ago

True or False: A race car driver tested his car for time from 0 to 60 mph, and for 20 tests obtained a mean of 4.85 seconds with

sattari [20]

Answer:

The given statement is false.

Step-by-step explanation:

We are given the following in the question:

95% confidence interval: (4.53,5.18)

Sample mean, $\bar{x}$ = 4.85 seconds

Sample size, n = 20

Alpha, α = 0.05

Sample standard deviation, σ = 1.47 seconds

Degree of freedom = n - 1 = 19

95% Confidence interval:

$\bar{x} \pm t_{critical}\displaystyle\frac{s}{\sqrt{n}}$

Putting the values, we get,

$t_{critical}\text{ at degree of freedom 4 and}~\alpha_{0.01} = \pm 2.09$

$4.85 \pm 2.09(\dfrac{ 1.47}{\sqrt{20}} )\\\\ = 4.85 \pm 0.69 \\\\= (4.16 ,5.54)$

Thus, the calculated confidence interval is different from the given confidence interval.

Hence, the given statement is false.

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4 years ago

LEAST COMMON MULTIPLE OF 27 , 48, 66

MrRissso [65]

$27|\fbox3\\.\ 9|3\\.\ 3|3\\.\ 1|\\------------\\48|\fbox2\\24|2\\12|2\\.\ 6|2\\.\ 3\fbox3\\.\ 1|\\------------\\66|\fbox2\\33|\fbox3\\11|11\\.\ 1|\\=====================\\LCM(27;\ 48;\ 66)=3\times3\times3\times2\times2\times2\times2\times11=4,752\\\\Answer:\boxed{LCD(27;\ 48;\ 66)=4,752}$

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3 years ago

Read 2 more answers

How does the volume of a cylinder change when it’s diameter is doubled

zavuch27 [327]

Recallin that, the diameter is twice as long as the radius, namely the radius is half the diameter, so, if the diameter is doubled, the radius is also doubled.

$\bf \textit{volume of a cylinder}\\\\
V=\pi r^2 h\quad 
\begin{cases}
r=radius\\
h=height\\
-----\\
r=\stackrel{doubled}{2r}
\end{cases}\implies V=\pi (2r)^2 h
\\\\\\
V=\pi (2^2r^2)h\implies V=\pi 4r^2 h\implies V=4~(\pi r^2 h)$

notice, the new volume is 4 times (πr² h), namely 4 times the original.

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3 years ago