If matrix C represents (A-B)+A, the value of the entry represented by C41 is

The value of the entry represented by is 12.

Step-by-step explanation:

Let and . The sum of equal-sized matrices consist in the sum of each pair of corresponding elements. If , then:

(1)

Then, is the element of matrix C located in the fourth row and first column and is defined by the following expression:

(2)

If we know that and , then is:

The value of the entry represented by is 12.

hello,

b) 62.47% of the students are between 14 and 18 years old.

step-by-step explanation:

mean = 15 and standard deviation = 2

student between 14 to 18

formula used z-score

for age 14 , z score

using z-table , p(z> -0.5)=0.3085

for age 18 , z score

using z-table , p(z< 1.5)=0.9332

p(-0.5< z< 1.5)=0.9332-0.3085 = 0.6247

thus, 62.47% of the students are between 14 and 18 years old.

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