Question

Jon and Lexi are playing a marble game. According to their rules, 4 points are awarded for each red marble collected and 7 points are awarded for each blue marble collected. Which expression represents Jon's total score if he has r red marbles and b blue marbles?

4r − 7b
2r − 7b
11rb
4r + 7b

Answer 1

Any ideas?

Answer 2

4r+7b

Answer 3

AmauryP please don't give out the answer

Answer 4

Sorry :P

Answer 5

I was about to say 4r+7b

Answer 6

correct?

Answer 7

yes

Answer 8

yaaay!!!! :)

Answer 9

that's because a red marble gives you 4 points. So if you have r red marbles, then you get 4r points from just the red

Answer 10

similarly, each blue marble gives you 7 points. So if you have b blue marbles, then you get 7b points from just the blue

Answer 11

So add up these two counts to get 4r+7b to get the total

Answer 12

how do u know whether to add or subtract??

Answer 13

we want the total, so we add

Answer 14

if we wanted the difference, we'd subtract

Answer 15

oh ok :) ;p i knew that hahahhahaha