Which system of equations has only one solution? 4 x + 2 y = 8. Negative 4 x minus 2 y = 3.
Negative 5 x + y = 6. 5 x minus y = negative 6.
Negative 3 x + 4 y = 2. 3 x minus 4 y = 0.
2 x + 4 y = 6. 3 x minus 4 y = 9.

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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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answer: 7

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