6. Ed bought a coat that usually costs $150. He purchased the coat at a 20% DISCOUNT. How much did Ed pay for the coat?
a) $170
b) $30 c) $120
d)$100
7. The Wheeler's bill at the restaurant was $43.00. How much money should Mr. Wheeler leave as a tip if he
plans to tip 15%?

6. c. 120

7. $6.45

Step-by-step explanation:

1. 150 x 0.20 = 30

2. 150- 30= 120

1. 43 x 0.15= 6.45

the answer would be a 24

step-by-step explanation:

c=2πr=2·π·3=24

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