What is the nth ternm of this sequence -4,1,6,11,16,

a 5n-4
b -4n+5
c -9n
d 5n-9

Step-by-step explanation:

Given sequence:

It is an AP with:

Nth term of this sequence is:

Correct option is d.

Step-by-step explanation:

where, L is the last term;

a is the first term ;

n is the number of terms;

and d is the common difference.

Therefore, the last term is (5n-9).

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:

the first one is x^2+2x+2

the second one is x^2+4

the last one is x^2-4x+8