(–12x + 6) + (4x – 12)

We can -6(2x - 1) + 4(x - 3)

or we can have -8x - 6, which equals -2(4x + 3)

Step-by-step explanation:

There are two things that can be done to this question.

one thing is to solve to the lowest value, and the second is to compress the expression with common multiples

so since -6 is common to -12x + 6 and 4 is common to 4x - 12, then we can have

-6(2x - 1) + 4(x - 3)

Or we can expand and reduce and have

-12x + 4x + 6 - 12

-8x - 6

since -2 is a common multiple of both, we can now have

-2(4x + 3)

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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