Exponents & roots

Calculate: $\sqrt{0{,}25}$

Show that $3^{5}\times3^{4}=3^{9}$

Simplify, leaving the answer as a power of 8: $8^{5}\times8^{4}$

Write as a SINGLE power: $9^{2}\times9^{6}$

Solve for x: $x^{2}=49$

Calculate: $\sqrt[3]{8}$

Simplify, leaving the answer as a power of 7: $7^{4}\times7^{2}$

Calculate: $\sqrt{9}$

Calculate: $20^{2}$

Between which two consecutive whole numbers does $\sqrt[3]{194}$ lie? Show how you know.

Between which two consecutive whole numbers does $\sqrt[3]{108}$ lie? Show how you know.

Simplify, leaving the answer as a power of 10: $10^{9}\div10^{4}$