Aparent wants to estimate the mean word length for the words in a child's board book. they randomly select one of their child's board books which has 8 pages and then randomly select two words off of the page and record the number of letters in each word. the table shows the results from the survey. using the sample results estimate the mean word length of any word in the book. *

a.3.3 letters

b.4.12 letters

c.8.25 letters

d.66 letters

I think it is B

Step-by-step explanation:

answer: 800

step-by-step explanation:

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