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3 years ago

Please help me asap!

Mathematics

2 answers:

Doss [256]3 years ago

4 0

1). 6x + 15 = 3
6x = -12
X = -2

2). 9 + 9x= 2x + 1
9 + 7x = 1
7x=-8
X = -8/7

Pavlova-9 [17]3 years ago

3 0

Answer:

3(2x+5)=3 6x+15 = 3 6x = -12 x =-2

9+9x=2x+2 9x-2x= 2-9 7x= -7 x=-1

Step-by-step explanation:

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Read 2 more answers

A population of monkeys' tail lengths is normally distributed with a mean of 25 cm with a standard deviation of 8 cm. I am prepa

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Answer:

The probability that the mean of my sample will be between 24 and 25 cm

P(24 ≤X⁻≤25) = 0.4772

Step-by-step explanation:

Step(i):-

Given mean of the Population 'μ'= 25c.m

Given standard deviation of the Population 'σ' = 8c.m

Given sample size 'n' = 256

Let X₁ = 24

$Z_{1} = \frac{x_{1}-mean }{\frac{S.D}{\sqrt{n} } } = \frac{24-25}{\frac{8}{\sqrt{256} } } = -2$

Let X₂ = 25

$Z_{2} = \frac{x_{2}-mean }{\frac{S.D}{\sqrt{n} } } = \frac{25-25}{\frac{8}{\sqrt{256} } } = 0$

Step(ii):-

The probability that the mean of my sample will be between 24 and 25 cm

P(24 ≤X⁻≤25) = P(-2≤ Z ≤0)

= P( Z≤0) - P(Z≤-2)

= 0.5 + A(0) - (0.5- A(-2))

= A(0) + A(2) ( ∵A(-2) =A(2)

= 0.000+ 0.4772

= 0.4772

Final answer:-

The probability that the mean of my sample will be between 24 and 25 cm

P(24 ≤X⁻≤25) = 0.4772

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3 years ago

I don't really understand this, could anyone possibly help me?

Tanya [424]

$\bf Step-by-step~explanation:\\$

$\bf13.$

We have to name a line that "contains" point P. This means that we have to find a line that passes through point P. We can see that line PS/n goes through point P.

$\bf14.$

We have to find the plane's name. The name (usually a letter) is usually on a corner of the plane, in caps. We could see that there is an F on the bottom left hand corner of the plane, so F is our plane name.

$\bf 15.$

To name an intersection of lines n and m, we have to find the point where they intersect and name it. We could see that point R goes through both lines, so that is our answer.

$\bf 16.$

We have to name a point that does not contain lines l, m, or n. Point W is a point that is not on any of the lines.

$\bf 17.$

Another name for line n is also line PS (add a line on the top of PS when writing this!) because point P and point S are two points on line n.

$\bf 18.$

Line l does not intersect lines n or m because those lines do not go through line l at all.

$\large\boxed{\bf Our ~final~answers:~In~bold}$

8 0

3 years ago