What is the sum sqaure root-2 and sqaure root -18

The correct answer is that 4√- 2 is the simplest radical form of this mathematical expression and 8i (i = imaginary unit) is the solution if we want to find out the square root of a negative signed number.

Step-by-step explanation:

1. Let's write in a mathematical expression the information given:  

Sum square root of -2 and the square root of - 18

√- 2 + √ - 18

√- 2 + √ 9 . - 2 ( 9 * -2 = - 18)

√- 2 +  3 √ - 2  (√ 9 = 3)

4  √- 2

This is the simplest radical form of this mathematical expression.  If we want a concrete number, we should remember that if we refer to the imaginary numbers we can find the solution for √-2 = 2i, or for any other negative number, where i is the imaginary unit. This unit can be used for the development of the square root of negative signed numbers.

Then,

4  √- 2 = 4 (2i) = 8i

The correct answer is that 4√- 2 is the simplest radical form of this mathematical expression and 8i (i = imaginary unit) is the solution if we want to find out the square root of a negative signed number.

the other guy is right

Step-by-step explanation:

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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