Choose the statement(s) which is (are) true of a normal distribution
I. it is symmetric about the mean
IL the shape of the graph of a normal distribution is
mound-shaped
II. 99.7% of the data is within 2 standard deviation of the
mean
A I only
C III only
® II only
O I and II only

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

yep b and c r the correct got it! : )