[ A classmate was completing the square to solve 4x2 + 10x = 8. For her first step she wrote 4x2 + 10x + 25 = 8 + 25. What was her error? ] guys please, theres 50 points for this and i really need help. im begging you.

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I think she forgot to square

Step-by-step explanation:

6/20

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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