Help its a test

B

Step-by-step explanation:

well there’s an easy way to do this. if i explain it it’ll be easier to understand where i’m coming from.

See all we have to do, is take the 12.50 and subtract it from 71.. which you would get 58.5.

now all we have to do is count up to 58.5 by 4.5

if you do that long enough you get 18.5 so r is 18.5

amd there you have your answer. if you did it by A, it would’ve taken a lot longer and been much more difficult

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

final total: 63

step-by-step explanation:

60 times sales tax

60 times 0.05

3

60 + 3

63