7. a number of minor automobile accidents occur at various high-risk intersections in teton county despite traffic lights. the traffic department claims that a modification in the type of light will reduce these accidents. the county commissioners have agreed to a proposed experiment. eight intersections were chosen at random, and the lights at those intersections were modified. at the .01 significance level, is it reasonable to conclude that the modification reduced the number of traffic accidents?

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step-by-step explanation:

24

step-by-step explanation:

hard

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