Matthew has twice as many stickers as david. how many stickers must matthew give david so that they each will have 120 stickers?

M is Matt's sticker count, D is David's:  

The equations:  

The average sticker count has to be 120, so:  

(M + D) / 2 = 120  

Matt has twice as many as David:  

M = 2D  

Substitute for M in the average, so:  

(2D + D) / 2 = 120  

Solving you get:  

3D = 240  

D = 80 and 120 - 80 is 40, so Matt has to give him 40 stickers.

Hope this helps :)

first option

a function is a relation in which an input is paired with exactly one output.

so, let's find the right answer.

in our first option, our inputs are january, february, and march. the outputs are 30, 28, and 25. each input has it's own output. this is correct!

our second option we know is incorrect, because ms. valverade has two outputs, dogs and cats. this is not a function.

our third option is incorrect as well. the yellow square has two ouputs, the square and the triangle.

lastly, in our fourth option, we see the number 7 two times with a different output. therefore, this is not a function.

remember: each input must be paired with only one output!

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