Question

answer please i need help with this

Answer 1

$\qquad\qquad\huge\underline{\boxed{\sf Answer}}$

Let's evaluate ~

$\qquad \sf  \dashrightarrow \: \dfrac{1}{3 {}^{ - 2} \times {x}^{ - 4} \times {y}^{2} }$

plug in the values :

$\qquad \sf  \dashrightarrow \: \dfrac{1}{3 {}^{ - 2} \times {3}^{ - 4} \times { - 1}^{2} }$

$\qquad \sf  \dashrightarrow \: \dfrac{1}{3 {}^{ - 6} {}^{ } {}^{} }$

$\qquad \sf  \dashrightarrow \: {3}^{6}$

$\qquad \sf  \dashrightarrow \:729$

Therefore, B is the Correct choice ~

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Answer 2

Answer:

729

Step-by-step explanation:

Given expression:

$\sf \dfrac{1}{3^{-2}x^{-4}y^2}$

Apply exponent rule $\sf \dfrac{1}{a^{-b}}=a^b$

$\sf \implies \dfrac{3^2x^4}{y^2}$

$\sf \implies \dfrac{9x^4}{y^2}$

Substituting x = 3 and y = -1:

$\sf \implies \dfrac{9(3)^4}{(-1)^2}$

$\sf \implies \dfrac{9 \cdot 81}1}$

$\sf \implies 729$