Evaluate each expression. 1) 3xy when x = - 1 and y = 2
2) 4(x – 3) when x = 3
3) x2 + 5x + 6 when x = - 2

1. -6

2. 0

3. -8

Step-by-step explanation:

1. 3×(-1)×2= -6

2. 4(3-3)= 4(0)= 0

3. (-2)2+5(-2)+6= (-4)+(-10)+6= -8

it is x=-4

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: