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algol13
3 years ago
6

Which expression has a positive value?

Mathematics
1 answer:
Leokris [45]3 years ago
3 0

Answer:

im pretty sure C. 3(-64-8) + 25 will give you a positive value

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A subway train makes six stops of equal length during its 21 km run. The train is actually moving for 20 minutes of the trip. At
photoshop1234 [79]

Answer:

The subway train can stop for a maximum of 2.5 minutes on each stop.

Step-by-step explanation:

3 0
3 years ago
Dont want to fail final exams lol pls help
aliya0001 [1]

Answer:

x = -2

Step-by-step explanation:

you have to multiply to remove the fraction, then set equal to 0

and solve.

4 0
2 years ago
Read 2 more answers
A researcher studying the sleep habits of teens will select a random sample of n teens from the population to survey. The resear
kati45 [8]

Answer:

D. The center remains constant, and the area in the tails of the distribution decreases.

Step-by-step explanation:

Hello!

Be it two independent random variables, X~N(μ;σ²) and U~Xₙ², the variable t is determined by the quotient between a random variable N(0;1) and the square root of a Chi-Square variable divided by its degrees of freedom:

t= \frac{(X-Mu)/Sigma}{\sqrt{U/n} }

As a consequence of this, the structure of the distribution depends on the parameter n (degrees of freedom), it is centered in zero and has a bell-shape similar to the normal distribution.

It has a mean and variance:

E(t)= 0 for n > 1

V(t)= \frac{n}{n - 2} n > 2

As you can see the variance of the distribution is directly affected by its degrees of freedom, which means that when the degrees of freedom change, the variance of the distribution change and so does its shape.

When ↑n ⇒ ↑V(t) ⇒ The area under the tails increases.

When ↓n ⇒ ↓V(t) ⇒ The area under the tails decreases.

In this example, the degrees of freedom of the distribution decreased from 40 to 20, then the variance of the distribution decreases and it "flattens", i.e. the area under the tails gets lowered.

The E(t) isn't affected by the modification of n, so the distribution remains centered in zero.

I hope this helps!

6 0
3 years ago
Help. 20 points
Alex17521 [72]
G(x)=1.58In(-)+7 is actually not the same is different but is the same because the have the x and the -
7 0
3 years ago
Use the Pythagorean Theorem to
Lunna [17]

Answer:  This is not a right triangle.

the squares of the two shorter sides must add to the equal the square of the longest side.

a² + b² = c²

Step-by-step explanation:

5² + 5² ?=? 12²

25 + 25 ≠ 144

50 ≠ 144   So this is not a right triangle.

3 0
3 years ago
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