What is the sum of k and the opposite of k?

The opposite of a number  or a variable is the number or variable written with a negative sign.For example opposite of 4 is -4.Opposite of x is -x.

The question is first asking us to write opposite of variable k.

The opposite of k is -k.The question is then asking us to find the sum of  k and the opposite of k .That is k+(-k)= k-k =0

When two opposites are added the result is 0.

1/4 because there is 4 grades.

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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step-by-step explanation: