Nick bought a music player. the price was $172, and the sales tax rate was 7 percent. how much sales tax did nick pay when he bought the
music player?
a.
$7.20
b. $12.04
c.
$12.45

B

Step-by-step explanation:

7% of 172 is 12.04

answer: plz put a pic in so i can answer it

step-by-step explanation:

x^2 + 81

we can factor this using difference of square binomials.

rewrite the equation:

x^2 - (-81)

factor:

(a^2 - b^2) = (√a^2 + √b^2)(√a^2 - √b^2)

(x^2 - (-81) = (x + √-81)(x - √-81)

we can remove the - from under the radical by multiplying it by i.

(x^2 - (-81) = (x + i√81)(x - i√81)

(x^2 - (-81) = (x + 9i)(x - 9i)

we can check our answer by using foil:

x^2 - 9ix + 9ix - 81i^2

x^2 - 81^2

i^2 = -1

x^2 + 81