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adoni [48]
3 years ago
15

Which statement about equations and expressions is true? An example of an equation is 4.5 + x = 13.2 because it shows that two e

xpressions are equal. An example of an expression is 4.5 + x = 13.2 because it shows that two equations are equal. An example of an equation is 4.5 + x = 13.2 because it is a mathematical phrase represented by numbers, a variable, and operations. An example of an expression is 4.5 + x = 13.2 because it is a mathematical phrase represented by numbers, a variable, and operations.
Mathematics
2 answers:
Digiron [165]3 years ago
7 0

Answer:

An example of an equation is 4.5 + x = 13.2 because it shows that two expressions are equal.

An example of an expression is 4.5 + x = 13.2 because it’s a mathematical phrase represented by numbers, a variable , and operations .

Step-by-step explanation:

Naya [18.7K]3 years ago
5 0

Answer:

An example of an equation is 4.5 + x = 13.2 because it shows that two expressions are equal.

Step-by-step explanation:

An equation is a mathematical sentence that has two equal sides separated by an equal sign.

An equation is a mathematical statement that two things are equal. It consists of two expressions, one on each side of an 'equals' sign.

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Write a fraction that is equivalent to a terminating decimal between 0.5 and 0.75
fomenos
0.5 = 1/2 = 2/4 = 4/8 = 8/16 = 16/320.75 = 3/4 = 6/8 = 12/16 = 24/32
Then the fractions in between are 5/8, 9/16, 11/16, 17/32, 19/32, 21/32, 23/32
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3 years ago
Triangle P Q R is shown. Angle Q P R is a right angle. The length of Q P is 8 StartRoot 3 EndRoot and the length of P R is 8.
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Answer: Length of side QR is 16 units.

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QPR= 90degrees

6 0
1 year 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.

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Answer:

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Step-by-step explanation:

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