Answer
a. $x^{11}$
b. $\frac{t^4}{16}$
c. $81y^{10}$
Work Step by Step
a.
$x^7 \times x^4$
$=x^{7+4}$
$=x^{11}$
b.
$(\frac{t}{2})^4$
$=\frac{t^4}{2^4}$
$=\frac{t^4}{16}$
c.
$(9y^5)^2$
$=9^2y^{5\times 2}$
$=81y^{10}$
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