Use the distributive property to expand each expression.

a. 3(10n + 9) b. 8(x + 5)

c. 12(6k - 3) d. a(b + 4)

[] Answer []

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[] Explanation []

Distributive Property: A (B + C) = (A * B) + (A * C)

3(10n + 9)

--------

(3 * 10) + (3 * 9)

8(x + 5)

--------

(8 * x) + (8 * 5)

12(6k - 3)

--------

(12 * 6k) - (12 *3)

a(b + 4)

--------

(a * b) + (a * 4)

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:

i only know the sequence of arithmetic it adds the first is 5+4 then it goes up as it adds to then it is 9+5 then 14+6 then to 20+7 and so on. 5,9,14,20,27,35.

step-by-step explanation: