Write each of the following in exponential form:

(i)

(ii)

By what number should be multiplied so that the product may be equal to ?

By what number should (-15)^-1 be divided so that the quotient may be equal to (-5)^-1?

Evaluate:

(i) 5^-2

(ii) (-3)^-2

(iii)

(iv)

Express each of the following as a rational number in the form:

(i) 6^-1

(ii) (-7)^-1

(iii)

(iv)

(v)