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kogti [31]
3 years ago
11

PLZ HELP AND SHOW UR WORK IF POSSIBLE . DON'T ANSWER IF U DON'T KNOW AND PLZ ANSWER ALL THREE PARTS

Mathematics
1 answer:
AVprozaik [17]3 years ago
6 0
Part A: 
There are 8 possible outcomes.
HHH
TTT
HTH
THT
TTH
HHT
THH
HTT

Part B:
There is 2 outcomes that consist of all head or all tails.

Part C:
You would expect about 6 students to get all head or all tails.

Hope this helps c:



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A train must climb a constant gradient of 5.5m for every 200m on track. Find the angle of incline
Eduardwww [97]
<span>angle = arcsin(5.5/200) = 1.575 degrees</span>
4 0
3 years ago
Read 2 more answers
What are the x-intercepts of y=x^2+2x-15
Sedbober [7]

Answer:

(-5,0) and (3,0)

Step-by-step explanation:

Think about it.

What two numbers multiply to -15 and add up to 2?

The answers are 5 and -3.

So plug that into the factored form of a parabola.

y=(x+5)(x-3)

To find the x-intercepts, plug in 0 for y.

(x+5)(x-3)=0

Since we are multiplying, at least one of the terms has to equal 0.

x+5=0 \\ x-3=0 \\ \\ x=-5,3

So the x-intercepts are (-5,0) and (3,0).

8 0
3 years ago
The perimeters of the triangles shown below are equal
Naya [18.7K]

Answer:

x=19

Step-by-step explanation:

The perimeter of the right triangle is

P=9+12+15 =36

The perimeter of the left triangle is

P =x-7+ x-7+ x-7 = 3x-21

Set them equal

36 = 3x-21

Add 21 to each side

36+21 = 3x-21+21

57 = 3x

Divide each side by 3

57/3 = 3x/3

19 =x

6 0
3 years ago
Read 2 more answers
PLEASE HELP FOR BRAINLIEST! ;)
IrinaVladis [17]

1. D - Since it's random, everyone has an equal chance of being picked

2. B - Since the people are already registered voters it would be easier to get a response from them. Plus, picking ever 10th person makes it random.

3. false - a fair question wouldn't make assumptions about the population

4. B - "Don't you think" causes the answerer to be pushed towards saying yes

hope this helps :)

5 0
3 years ago
In 2014, the CDC estimated that the mean height for adult women in the U.S. was 64 inches with a standard deviation of 4 inches.
Vladimir79 [104]

Answer:

A. 16%

Step-by-step explanation:

Problems of normally distributed samples can be solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the zscore of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this problem, we have that:

\mu = 64, \sigma = 4

Which of the following gives the probability that a randomly selected woman has a height of greater than 68 inches?

This is 1 subtracted by the pvalue of Z when X = 68. So

Z = \frac{X - \mu}{\sigma}

Z = \frac{68 - 64}{4}

Z = 1

Z = 1 has a pvalue of 0.84.

1 - 0.84 = 0.16

So the correct answer is:

A. 16%

6 0
3 years ago
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