Apply the exponent rules for each one:
When a number is raised by negative value, it changes to a fraction with the denominator raised to the power:
A number raised by 0 always = 1
1. 7^-2 = 1/7^2 = 1/49
2. 15^0 = 1
3. 10^-3 = 1/10^3 = 1/1000
4. 2^-5 = 1/2^5 = 1/32
5. 5^-3 = 1/5^3 = 1/125
6. 7^3 = 7x7x7 = 343
