4 students is 20% of 20 students is it correct

Mathematics

2 answers:

dezoksy [38]2 years ago

8 0

Yes ma'am it is correct

Zinaida [17]2 years ago

6 0

Correct. To find this answer you would make 4 out of 20 an equivalent expression to 100. 20*5=100 4*5=20, therefor 4 out of twenty is equal to 20 out of 100, or 20%.

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When I visit my brother it is a 532 mile round trip. If I visit my brother once a month how many miles would I travel in a year

almond37 [142]

Answe12800 miles

Step-by-step explanation:a year is 12 months, and mile round trip means there and back. so 532x24 for the 24 trips that equals 12768. 12768 rounded to the nearest hundreds is 12800

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3 years ago

A square has side length represented by X +4 inches write an expression to represent the area. Express your answer as a trinomia

romanna [79]

Answer:

$A=(x^2+16+8x)\ \text{inches}^2$

Step-by-step explanation:

Given that,

The side length of a square, l = (x+4) inches

We need to find an expression to represent the area of the square.

The area of a square is given by :

$A=\text{side}^2$

So,

$A=(x+4)^2\\\\A=(x^2+16+8x)\ \text{inches}^2$

So, the area of the square is $(x^2+16+8x)\ \text{inches}^2$ .

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3 years ago

The average life of a certain type of small motor is 10 years with a standard deviation of 2 years. The manufacturer replaces fr

taurus [48]

Answer:

A guarantee of 6.24 years should be offered.

Step-by-step explanation:

Problems of normally distributed samples are 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:

$\mu = 10, \sigma = 2$