Find the upper limit for the zeros of the function
P(x) = 4x 4 + 8x 3 - 7x 2 - 21x - 9

We need to find the zeros.

4x^4 + 8x^3 - 7x^2 -21x - 9

You're supposed to use synthetic division, assuming you're in algebra 2. I removed my calculus work.

x = -1 1/2, 1+sqrt5/2  , 1-sqrt5/2

x= -1.5000000119775176

4x 4 + 8x 3 - 7x 2 - 21x - 9= 0

x= -0.618033988749895

4x 4 + 8x 3 - 7x 2 - 21x - 9= 0

x= 1.618033988749895

4x 4 + 8x 3 - 7x 2 - 21x - 9= 0

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:

a c

step-by-step explanation: