to have 2.40$ between 30 dimes and nickels she would have to have 18 dimes being 1.80$ and 12 nickles being .60 cents.
0.75^2 = 0.5625.....sq rt 0.5625 = 0.75
10/45 for black
12/45 for green
3/45 for orange (can be simplified to: 1/15)
20/45 for blue
Additive Inverse. -5 and 5 are opposites.
