Activity : Find the factors of the following polynomials.

Mathematics

1 answer:

Pavlova-9 [17]4 years ago

8 0

Step-by-step explanation:

1) x^2-5x+x-5

=x(x-5)+1 (x-5)

=(x+1)(x-5)

3) a^2-25

= a^2-(5)^2

= (a+5)(a-5)

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A rectangular lot is 85 yards wide and 125 yards long. Give the length and width of another rectangular lot that has the same pe

BlackZzzverrR [31]

Perimeter = 2 * 85 + 2 * 125 = 420

85 * 125 = 10,625 area

70 by 140 = 420 perimeter

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7 0

4 years ago

The time for a professor to grade an exam is normally distributed with a mean of 16.3 minutes and a standard deviation of 4.2 mi

dangina [55]

Answer:

A.0.4477

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:

$\mu = 16.3, \sigma = 4.2$