Simplify the following polynomial expression. 5x^4-9x^3+7x-1)+(-8x^4+4x^2-3x+2)-( -4x^3+5x-1)(2x-7) A.  5x^4-37x^3-6x^2+41x-6
B.  11x^4-21x^3+14x^2+33x-8
C.  11x^4-21x^3+14x^2+33x-6
D.  5x^4-37x^3-6x^2+41x-8  

yes

step-by-step explanation:

yes

all three statements are true

step-by-step explanation:

a shipping fee of 5% is charged online with every item purchased online

first let's just take each option and calculate them based on this, to see if the answers matched

keith buys a 40 dollar book

40 x 0.05 = 2

therefore there will be a two dollar fee on keith's book

40 + 2 =42

the first statement is true

a chair costs $80

80 x 0.05 = 4

80 + 4 = 84

the second statement is true

george buys a 20 dollar calculator

20 x 0.05 = 1

20 + 1 = 21

the third statements are true

all three statements are true