Adimas found the mean of her 11 math test scores for the first semester. x = ? 81 using 81 as the mean, find the variance of her grades rounded to the nearest hundredth. ? 2 = find the standard deviation of her grades rounded to the nearest hundredth. ? =

how am i supposed to answer

step-by-step explanation:

Number nine is f(x)= 40x : ) hoped i ya

the polynomial is a perfect square trinomial of the form a^2-2ab+b^2:

option a. true

step-by-step explanation:

9x^2-12x+4

comparing with the form a^2-2ab+b^2

1.) a^2=9x^2

solving for a: square root both sides of the equation:

sqrt(a^2)=sqrt(9x^2)

a=sqrt(9) sqrt(x^2)

a=3x

2.) b^2=4

solving for b: square root both sides of the equation:

sqrt(b^2)=sqrt(4)

b=2

to be a perfet square trinomial 2ab must be equal to 12x. let's check:

2ab = 2 (3x) (2)

2ab = 12x

correct

the answer is:

mean: 6

mad: 2.14