Brandon solves x2+4x=9 by collecting all the terms on the left and making the right side equal to 0. When he uses the quadratic formula, what are his values for a, b, and c? Question 1 options:

a = 0, b = 4, c = -9

a = 0, b = 4, c = 9

a = 1, b = 4, c = -9

a = 1, b = 4, c = 9

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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step-by-step explanation: