-2(4a^2-3[4a^2-(5b+a^2)]}

10a^2 - 30b

Step-by-step explanation:

-2(4a^2 - 3[4a^2 - (5b + a^2)]

We have three brackets in the expression, so we open the brackets after the other

Step1: let's open

[ 4a^2 - ( 5b + a^2)]

Open the bracket with - (minus)

- * 5b = -5b

- * +a^2 = -a^2

= [4a^2 - 5b - a^2]

Step 2: open the bracket

( 4a^2 - 3[4a^2 - 5b - a^2]

Open the bracket with -3

-3 * 4a^2 = -12a^2

-3 * -5b = + 15b

-3 * -a^2 = +3a^2

= (4a^2 - 12a^2 + 15b + 3a^2)

Step 3 : open the final bracket

-2(4a^2 - 12a^2 + 15b + 3a^2)

-2 * 4a^2 = -8a^2

-2 * -12a^2 = + 24a^2

-2 * + 15b = -30b

-2 * + 3a^2 = -6a^2

= -8a^2 + 24a^2 - 30b - 6a^2

Step 4: collect the like terms

= -8a^2 + 24a^2 - 6a^2 - 30b

= 10a^2 - 30b

not enough information

step-by-step explanation:

we cannot know this, because the other students could have handed out 10 flyers, or they could have handed out 100. one way, the mean would go up, and another way, the mean would go down.