Hi there, can someone please help me with my math homework. It’s only the blue highlighted sums I need. Please help I’ll really appreciate it.
![Hi there can someone please help me with my math homework Its only the blue highlighted sums I need Please help Ill really appreciate it class=](https://us-static.z-dn.net/files/d14/9201048e7e37c4a88859a9a03c82f1c8.png)
Answer:
(15)
[tex]-mn(2m+7n)[/tex]
(16)
[tex]x^{3}[/tex]
(17)
[tex]9x^{3}[/tex]
(18)
[tex]6x^{5}[/tex]
(19)
[tex]21m^{5} n^{3}[/tex]