What is the solution to 3x^2-2+4=0
explain answer. i'm taking a practice test and don't understand this.

There are no real solutions

Step-by-step explanation:

Recall that for a quadratic equation in the form:

ax² + bx + c = 0

using the quadratic formula, that the discriminant of the formula is given by the following expression

Discriminant = b² - 4ac

If b² - 4ac < 0 > No real roots

If b² - 4ac > 0 > Two real roots

If b² - 4ac = 0 > One real roots

In our case, a = 3, b = -2 and c = 4

b² - 4ac = (-2)² - 4(3)(3) = 4 - 36 = -32 (which is <0)

Hence there are no real roots.

linear pair postulates

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: