(a) The coefficient of x^2 in the expansion of (1/x + 5x)^8 is equal to the coefficient of x^4 in the expansion of (a+5x)^7, a ∈ R. Find the value of a. (b) Find the coefficient of x^-2 in the expansion of (x-1)^3(1/x + 2x)^6

10000

step-by-step explanation: divide by 2,

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: