99 points
what is the product of (- a + 3)( a + 4)?
a ^2 - a - 12 not this one
-a ^2 - a - 12
-a ^2 - a + 12
a ^2 - a + 12

  -a^2 - a + 12

Step-by-step explanation:

You only need to find the products of the first and last terms to determine the correct

  (-a)(a) = -a^2

  (3)(4) = 12

You're looking for an expression with -1 as the leading coefficient and +12 as the constant. There is only one choice like that:

  -a^2 - a + 12

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

93-8=85

855=17

17*4=68

there are 68 purple marbles in that bag