Pls help I need to show work. Does anyone know how to do this?

Mathematics

1 answer:

7nadin3 [17]3 years ago

8 0

10.

9√256

= 9 × √256

= 9 × 16

= 144

11.

√3 × √2

= √(3 × 2)

= √6

12.

√9 × √9

= √(9 × 9)

= √81

= 9

13.

√20 × √8

= √(20 × 8)

= √160

= √(16 × 10)

= √16 × √10

= 4 × √10

= 4√10

14.

√20 × √10

= √(20 × 10)

= √200

= √(100 × 2)

= √100 × √2

= 10 × √2

= 10√2

You might be interested in

Mary and Jane both took PSY230 last semester but they were in two different sections taught by different professors. Mary's clas

Greeley [361]

Answer:

Due to the higher z-score, Jane did better in class.

Step-by-step explanation:

Z-score:

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 question:

Whoever's grade had the better z-score did better in class.

Mary's:

Mean of 85, standard deviation of 5, grade of 88. This means that $\mu = 85, \sigma = 5, X = 88$ . So