Kevin buys a bag of candy for $9.99, plus a tax rate of 4.2%. What is his final cost

12.37

Step-by-step explanation:The tax rate is 2.38 because 9.99/4.2 is 2.38, I add the tax and the original cost to get 12.37

with btw u said 100pts but it clearly says

i answerd and just got 10pts

no hate

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