## Algebra and Trigonometry 10th Edition

First way: $1+11=12$ Second way: $2+10=12$ Third way: $3+9=12$ Fourth way: $4+8=12$ Fifth way: $5+7=12$ Sixth way: $7+5=12$ Seventh way: $8+4=12$ Eighth way: $9+3=12$ Nineth way: $10+2=12$ Tenth way: $11+1=12$