Can soneone tell me if I have done this correctly?

Combine like terms. Write all answers in descending order.

1.4y^3 +2.9-7.7y-1.3y-4.1+9.6y^3 =
(9.6y^3+1.4y^3) +(-4.1+2.9) +(-7.7y-1.3y)=
11y^3-6.4y-1.2=
4.6^4-1.2

Question

Can soneone tell me if I have done this correctly?

Combine like terms. Write all answers in descending order.

1.4y^3 +2.9-7.7y-1.3y-4.1+9.6y^3 =
(9.6y^3+1.4y^3) +(-4.1+2.9) +(-7.7y-1.3y)=
11y^3-6.4y-1.2=
4.6^4-1.2

helder_edwin · Answer

the last line is completely wrong

anonymous · Answer

$$1.4y^3 +2.9-7.7y-1.3y-4.1+9.6y^3 $$first put the terms with the same exponents next to each other, starting from the largest exponent, which is 3

anonymous · Answer

$$1.4y^3+9.6y^3-7.7y-1.3y+2.9-4.1$$ then combine like terms

anonymous · Answer

okay! thanks everyone!