Mason and sanjay order pasta for $4.50, salad for $3.90, and 2 glasses of lemonade for $1.40 each. the tax is $0.90. how much change should they get from $15.00?

Ok so,

Let's add the prices for everything together:
4.50 + 3.90 + 1.40 + 1.40 + .90 = $12.10

Now let's subtract the total from how much money have:
15.00 - 12.10 = $2.90

So, they should get $2.90 back
Hope this helps!