KSA Grade 8 The Number System. Practice it free.

$15 \times 15 = 225$ and $(-15) \times (-15) = 225\textsf{,}$ so $x = \pm 15\textsf{.}$

$x = \sqrt{121} = 11$ because $11 \times 11 = 121$.

The Zero Exponent Property says that any nonzero base raised to the zero power equals one, written $y^{0} = 1\textsf{.}$ The stem states that $y \neq 0$, so the property applies and the expression simplifies to $1\textsf{.}$

Substitute $t = 4$: $f(4) = 4e^{8} + 50$. Since $e^{8} \approx 2{,}981$, $f(4) \approx 4(2{,}981) + 50 = 11{,}974 \approx 1 \times 10^{4}$.

$\sqrt{2} \approx 1.414$.

Multiply coefficients ($2 \cdot 3 = 6$) and add exponents: $3 + 4 = 7$, so $n = 7$.

$\dfrac{9 \times 10^{5}}{3 \times 10^{2}} = 3 \times 10^{3} = 3{,}000\textsf{.}$

$20 \times 20 = 400$ and $(-20) \times (-20) = 400\textsf{,}$ so $x = \pm 20\textsf{.}$