Write a polynomial function f of least degree that has rational coefficients, a leading coefficient of 1, and the zeros 4 and 3−i.

Step-by-step explanation:

Given

-- Leading coefficient

Required

Determine the polynomial

Represent the zeros with a and b

Such that

The polynomial is:

However, to solve further: We need to symmetrise over 3-i  and its conjugate

To define a suitable function, the expression becomes

Open bracket

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: