4,200+525(5×12)
4,200+525(60)=
4,200+31,500=35,700
3x5=$15
15+10=$25 total to spend
He spends 12.75+8.5= $21.25
25-21.25=$3.75 left
48 sets i believe since there are only 48 maximum of blue, green and yellow crayons therefore the 49th set would only contain a red crayons and a picture
2 times the square root of 5 . that’s what i got .