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Gnom [1K]
3 years ago
11

NEED HELP PLEASEE

Mathematics
1 answer:
Kruka [31]3 years ago
4 0

Answer:

Simplify−412+16t+48.h=16t−1633

Step-by-step explanation:

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Which expression correctly simplifies ... (see photo)
Anestetic [448]

Answer:

The last one

Step-by-step explanation:

FInd a common demominator which is 20 and multiply both so it turns into 4 19/20

8 0
2 years ago
The time for this event for boys in secondary school is known to possess a normal distribution with a mean of 460 seconds and a
AlekseyPX

Answer:

The time that the boys need to beat in order to earn a certificate of recognition from the fitness association is 511.264 seconds.

Step-by-step explanation:

We are given that the time for this event for boys in secondary school is known to possess a normal distribution with a mean of 460 seconds and a standard deviation of 40 seconds.

The fitness association wants to recognize the fastest 10% of the boys with certificates of recognition.

<u><em>Let X = time for this event for boys in secondary school</em></u>

SO, X ~ Normal(\mu=460,\sigma^{2} =40^{2})

The z-score probability distribution for normal distribution is given by;

                               Z = \frac{X-\mu}{\sigma} ~ N(0,1)

where, \mu = mean time = 460 seconds

            \sigma = standard deviation = 40 seconds

The Z-score measures how many standard deviations the measure is away from the mean. After finding the Z-score, we look at the z-score table and find the p-value (area) 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.

<u>Now, it is given that the fitness association wants to recognize the fastest 10% of the boys with certificates of recognition, which means;</u>

       P(X > x) = 0.10   {where x is the required time which boy need to beat}

       P( \frac{X-\mu}{\sigma} > \frac{x-460}{40} ) = 0.10

        P(Z > \frac{x-460}{40} ) = 0.10

<em>So, the critical value of x in the z table which represents the top 10% of the area is given as 1.2816, that is;</em>

<em>                   </em>      \frac{x-460}{40} =1.2816

                         {x-460}{} =1.2816\times 40

<em>                           </em>x = 460 + 51.264 = <u>511.264 seconds</u>

Hence, the time that the boys need to beat in order to earn a certificate of recognition from the fitness association is 511.264 seconds.

8 0
3 years ago
What is the domain of the relation {(0,1),(2,4),(3,7),(5,4)}​
Zina [86]

Answer:

(0 2,3,5)

Step-by-step explanation:

Domain is the x factor of every relation

7 0
3 years ago
A survey revealed that 10% of workers at a company were not satisfied with their job. If 88 workers selected this option, then h
prohojiy [21]

Answer:

There are 880 workers at the company.

Step-by-step explanation:

With the information provided, you can find the total amount of workers at the company which would represent 100% using a rule of three given that 88 workers represent 10% of workers:

88 workers →   10%

       x          ←  100%

x=(88*100)/10= 880

According to this, the answer is that there are 880 workers at the company.

5 0
3 years ago
PLSSSS HELPPP THANK YOOOUU!!Let f(x) = 3x + 5 and g(x) = 2x - 1 Perform the following function operation (if needed use ^ to mea
jek_recluse [69]

Answer:

I hope it will help you....

5 0
3 years ago
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