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3 years ago

PLS HELPPP

Mathematics

2 answers:

Olin [163]3 years ago

8 0

I think 80 I’m not sure ........

Sidana [21]3 years ago

6 0

Answer:

oh i hade this i got wrong but the answer is 79

Step-by-step explanation:

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If the mean of a data set is 100 and almost all the data is from 40 to 160, what is a good approximation of the variance?

Travka [436]

A.) 120

The variance is the range of a data set, which shows how spread out numbers are. To get the variance, we take the last number and subtract it from the first number. 160-40=120. Therefore, there is 120 numbers between 40 to 160.

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3 years ago

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What are the square number factors of 56?

balandron [24]

Answer:

2,4,7,8,14,and 28

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2 years ago

What is the value of x2 + 2y ÷ 2w + 3z for w = 2, x = 5, y = 8, and z = 3?

pav-90 [236]

The answer to this question is 23

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4 years ago

Sphere A and Sphere B , are similar. The volumes of A and B, are 17 and 136 cubic centimetres, respectively. The diameter of B ,

xxMikexx [17]

Answer:

Step-by-step explanation:

Given: Sphere A and Sphere B are similar.

The volumes of A and B are 17 $cm^3$ and 136

The diameter of B is 6 cm.

To find: diameter of A

Solution:

Let R denotes radius of sphere A and r denotes radius of sphere B.

Radius of sphere A= R

Diameter of sphere B = 6 cm

So, radius of sphere B (r) = $\frac{6}{2}=3\,\,cm$

Volume of sphere is $\frac{4}{3}\pi(radius)^3$

Volume of sphere A = $\frac{4}{3}\pi(R)^3$

$\frac{\frac{4}{3}\pi R^3}{\frac{4}{3}\pi r^3}=\frac{17}{136}=\frac{1}{8}\\\frac{R^3}{r^3}=\frac{1}{8}\\\frac{R}{r}=\frac{1}{2}\\r=2R$

Put r = 3 cm

$3=2R\\R=\frac{3}{2}=1.5\,\,cm$

Diameter of sphere A = 2 × Diameter

= 2 × 1.5

=3 cm

6 0

3 years ago

Help please!!!! ;-; staph scrolling

sertanlavr [38]

$y = 4^x \quad \to\quad y = - \frac 2 3 (4^{x+7}) - 5$

$y=4^x$

OK, we'll go in steps. First a reflection through the x axis, which negates y.

$y = -4^x$

Now a vertical scaling of 2/3

$y = -\frac 2 3 \cdot 4^x$

Now we shift seven units to the right,

$y = -\frac 2 3 \cdot 4^{x+7}$

Now down five,

$y = -\frac 2 3 \cdot 4^{x+7} - 5$

There it is.

Answer: reflection thru x axis, vertical scale 2/3, right shift 7, down 5, second choice

8 0

4 years ago