What number should be added to 77 to make the sum 0?   77  –77  0  –76

-77

Step-by-step explanation:

Let the unknown number be x.

We have been asked to find the unknown x.

It is given that when the unknown x is added to 77, the sum will be zero. Thus the mathematical representation will be:

Taking the unknown to one side of the equation ad solving:

Thus the required number is -77.

the answer is c just got it on ed

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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