Factor the polynomial below. x^2 + 15 + 56

Mathematics

2 answers:

emmasim [6.3K]4 years ago

8 0

Answer:

Step-by-step explanation:

x²+15x+56 =(x+7)(x+8)

bazaltina [42]4 years ago

3 0

Answer:

x=-7, x=-8

Step-by-step explanation:

x^2 +15x +56=0

look for two numbers that their sum is 15 and their product =56

(x+7)(x+8)=0

x=-7, x=-8

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Find the indicated IQ score. The graph depicts IQ scores of adults, and those scores are normally distributed with a mean of 100

Taya2010 [7]

Answer:

IQ score of 102.55

Step-by-step explanation:

Problems of normally distributed samples can be 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, which is also the shaded area under the curve, 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:

$\mu = 100, \sigma = 15$