Question

Which equations are correct?

Select each correct answer.



5x3(6x4)=30x7
4c4(3c2)=12c8
3b3(−2b4)=−6b12
5y4(2y5)=10y9

Answer 1

its c hope this helps !!!!!!

Answer 2

D

Explanation:

We have to find which equation is correct in give options

A.
`5* 3(6* 4)=30* 7`

`5* 3(6* 4)=5* 6* 3* 4=30* 12`

Hence, option A is wrong.

B.
`4c^4(3c^2)=12c^8`

`4c^4(3c^2)=12c^{4+2)=12c^6`

When base same in multiplication then the power will be added.

Hence, option B is false.

C.
`3b^3(-2b^4)=-6b^(12)`

`3b^3(-2b^4)=-6b^(3+4)=-6b^7`

Hence, option C is false.

D.
`5y^4(2y^5)=10y^9`

`5y^4(2y^5)=10y^(4+5)=10y^9`

Hence, option D is correct.