Simplify using the laws of exponent

Answer:
1.
[tex] {x}^{7} [/tex]
2.
[tex] {x}^{10} [/tex]
3.
[tex] {m}^{4} {n}^{4} [/tex]
4.
[tex]16 {a}^{2} {b}^{6} [/tex]
5.
[tex] {r}^{15} [/tex]
6.
[tex]25 {r}^{6} {t}^{8} [/tex]