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bija089 [108]
3 years ago
14

2. Which of the expressions below is equivalent to:

Mathematics
1 answer:
jok3333 [9.3K]3 years ago
4 0

Step-by-step explanation:

4\sqrt{27} + 3\sqrt{12}

First, let's rewrite the numbers inside the square roots as factors that include squares:

4\sqrt{9 * 3} + 3\sqrt{4 * 3}

Now, we can take the square root of these squares, while keeping the remaining factor(s) inside of the square root:

(4*3)\sqrt{3} + (3*2)\sqrt{3}

12\sqrt{3} + 6\sqrt{3}

18\sqrt{3}

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Merta reports that 74% of its trains are on time. A check of 60 randomly selected trains shows that 38 of them arrived on time.
kenny6666 [7]

Answer:

No, the on-time rate of 74% is not correct.

Solution:

As per the question:

Sample size, n = 60

The proportion of the population, P' = 74% = 0.74

q' = 1 - 0.74 = 0.26

We need to find the probability that out of 60 trains, 38 or lesser trains arrive on time.

Now,

The proportion of the given sample, p = \frac{38}{60} = 0.634

Therefore, the probability is given by:

P(p\leq 0.634) = [\frac{p - P'}{\sqrt{\frac{P'q'}{n}}}]\leq [\frac{0.634 - 0.74}{\sqrt{\frac{0.74\times 0.26}{60}}}]

P(p\leq 0.634) = P[z\leq -1.87188]

P(p\leq 0.634) = P[z\leq -1.87] = 0.0298

Therefore, Probability of the 38 or lesser trains out of 60 trains to be on time is 0.0298 or 2.98 %

Thus the on-time rate of 74% is incorrect.

6 0
3 years ago
Simplify expression<br>9-18÷3+7​
m_a_m_a [10]

Answer: 10

18 divide by 3 is 6 because you always divide first is this case

9-6+7 now solve straight across

9 minus 6 is 3 plus 7 is 10

Step-by-step explanation: Also

You are beautiful. You are amazing. You are wonderful. You are perfect just the way you are. Never worry about the way people think about you. Only worry if you like you. You are the most important person to yourself. Just be yourself. No can tell you who you can be. You are truly perfect just the way you are. Never tell yourself you are not good enough, you are enough. Never tell yourself "I'm ugly" you are beautiful. Never let yourself down.

3 0
3 years ago
Read 2 more answers
3/9=21/k what is the strategy for solving it
Vinvika [58]

Answer: k = 63

Step-by-step explanation: You need to multiply the left side by its reciprocal to move the numbers to the right. You also need to multiply by k on the right side to get it alone on the left. This will result in

(9/3)(3/9) = (21/k)(9/3) simplified

1 = 189/3k • k    then multiply by k

k = 189/3 simplify

k = 63

5 0
3 years ago
Select the equivalent expression.
posledela

Answer:

its a

Step-by-step explanation:

a x 4 = a^4

b^3 x 4 = b^12

4 0
3 years ago
3x^2-29x-18<br> Factor this completely.
Flauer [41]
Simplify:

step by Step

3x^2 - 29x -18

There are no like terms

Answer is: 3x^2 - 29x -18




Factor:
3x^2 - 29x -18
= 3x^2 - 29x - 18

Doesn't Factor

Answer: 3x^2 - 29x -18





Solution 2:

Simplifying
3x^2 - 29x - 18

3x^2 + 29x +  - 18

Reorder Terms:
- 18 + - 29x + 3x^2

Final Result:
- 18 + - 29x + 3x^2


Hope this helps!!!.



3 0
3 years ago
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