Can anyone help me on these short questions.. I have 3 braincells tat are dead so.help??

Step-by-step explanation:

Commutative propriety really means you can change (commute) the order you add or multiply numbers and the result will be the same

ab = ba

x+18 = 18+ x

Associative propriety means you can add in any order

3+(a+b) = (3+a) + b

Combine like terms is 8 of something - 3 of the same thing is 5 of something

8x^4  - 3x^4 = 5x^4

only the terms with b are the same kind

9b+ 4b -14 = 13b -14

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.

click to let others know, how is it

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