Question

Would someone be able to help me answer the following questions please?

A) 3c-9d+7c+5d
B) 4a+7b+5a-b
C) 6c+4d-c-7d

Answer 1

A) 3c-9d+7c+5d=
Group the same sexes
3c+7c-9d+5d=
3c+7c=10c
-9d+5d=-4d
Answered: 10c+4d

B)4a+7b+5a-b=
Group the same sexes
4a+5a+7b-b=
4a+5a=9a
+7b-b=+6b
Answered: 9a+6b

C)6c+4d-c-7d=
Group the same sexes
6c-c+4d-7d=
6c-c=5c
+4d-7d=+3d
Answered: 5c+3d

Answer 2

A.
`3c-9d+7c+5d \ \textgreater \ Group\;like\;terms \ \textgreater \ 3c+7c-9d+5d`


`\mathrm{Add\:similar\:elements:}\:3c+7c=10c \ \textgreater \ 10c-9d+5d`


`\mathrm{Add\:similar\:elements:}\:-9d+5d=-4d \ \textgreater \ 10c-4d`

B.
`4a+7b+5a-b \ \textgreater \ Group\;like\;terms \ \textgreater \ 4a+5a+7b-b`


`\mathrm{Add\:similar\:elements:}\:4a+5a=9a \ \textgreater \ 9a+7b-b`


`\mathrm{Add\:similar\:elements:}\:7b-b=6b \ \textgreater \ 9a+6b`

C.
`6c+4d-c-7d \ \textgreater \ \mathrm{Group\:like\:terms} \ \textgreater \ 6c-c+4d-7d`


`\mathrm{Add\:similar\:elements:}\:6c-c=5c\ \textgreater \ 5c+4d-7d`


`\mathrm{Add\:similar\:elements:}\:4d-7d=-3d \ \textgreater \ 5c-3d`

Hope this helps!