For the third marking period, Joey was reviewing his 7 test scores. On his report card, he received a grade of a 90. While reviewing his scores, he realized that he was missing one. He had the following test scores: 85, 90, 85, 95, 85, and 95. What is Joey's missing test score? Provide mathematical proof and reasoning for how you found the missing test score.

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

teleportation

step-by-step explanation:

(-infinity,infinity)