Subtract (5y3 + 6y + 3y4) from (4y4 - 8y3). with step by step work***

  4y⁴ - 8y³ - (5y³ + 6y + 3y⁴)

= 4y⁴ - 8y³ - 5y³ - 6y - 3y⁴

= (4y⁴  - 3y⁴) + (- 8y³ - 5y³) - 6y

= y⁴ - 13y³ - 6y

 y⁴ - 13y³ - 6y

well there are two answers for that.

1: you need 120 ones then that will equal up to 120.

2: you could also do one 100 and 2 tens.

those are the answers that i have thought of.

step-by-step explanation:

what grade level is this? need to know so i can look in my old textbooks!