Adding variables with same exponents

[rcmango]

Homework Statement

solve.

.2y^3 + .6y^3 - .5y^3

I believe the answer to be .3y^3

Homework Equations

The Attempt at a Solution

i got the answer to be .8y^3 - .5y^3

= .3y^3

I think this is correct, I'm not sure, please let me know if I finished this correctly.

 

[tiny-tim]

hi rcmango!
(try using the X² button just above the Reply box )

.2y^3 + .6y^3 - .5y^3

I believe the answer to be .3y^3

yes, that's fine

.2y³ + .6y³ - .5y³

= (.2 + .6 - .5)y³ = .3y³ (distributive law)

 

[rcmango]

Thanks.