3*1.5-2.5=4.5-2.5=2.0 or just 2.
4(8.62-6.37)=4*2.25=9.00 or just 9.
These demonstrate the distributive property. The first just uses PEMDAS or order of operation; the second uses the distributive property: 4*8.62-4*6.37(=34.48-25.48)=4(8.62-6.37)=4*2.25=9.