BEST ANSWER GETS BRAINLIEST What is 20c + 8d +10c - 5d

Mathematics

2 answers:

lukranit [14]3 years ago

7 0

Combine like terms for 30c +3d

alukav5142 [94]3 years ago

5 0

30c+3d
What you do is combine like terms, so you combine to to C’s and then combine the to D variables. Once you do that, you get 30c+3d
Hope this helped:)

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Lengths of full-term babies in the US are Normally distributed with a mean length of 20.5 inches and a standard deviation of 0.9

mash [69]

Answer:

66.48% of full-term babies are between 19 and 21 inches long at birth

Step-by-step explanation:

Normal Probability Distribution:

Problems of normal distributions can be solved using the z-score formula.

In a set with mean $\mu$ and standard deviation $\sigma$ , the z-score 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 p-value, we get the probability that the value of the measure is greater than X.

Mean length of 20.5 inches and a standard deviation of 0.90 inches.

This means that $\mu = 20.5, \sigma = 0.9$