Answer
a.$x^{2a}$
b. $2x^a$
c. $x^{a-b}$
d. $x^{a+b}$
e. This is already simplified.
Work Step by Step
a.
$x^a+x^a$
$x^{a+a}$
$x^{2a}$
b.
$x^a+x^a$
$2x^a$
c.
$\frac{x^a}{x^b}$
$x^{a-b}$
d.
$x^a\times x^b$
$x^{a+b}$
e.
$x^a+x^b$
This is already simplified.