3.10 Proficiency exam

( [link] ) $-\{-[(-6)]\}$

( [link] ) $-\left|-15\right|$

( [link] ) $-{\left[\left|-12\right|-10\right]}^2$

( [link] ) $-5(-6)+4(-8)-\left|-5\right|$

( [link] ) $\frac{3(-8)-(-2)(-4-5)}{(-2)(-3)}$

( [link] ) $-\left|7\right|-{(2)}^2+{(-2)}^2$

( [link] ) $\frac{-6(2)(-2)}{-(-5-3)}$

( [link] ) $\frac{-3\left\{\left[\left(-2-3\right)\right]\left[-2\right]\right\}}{-3\left(4-2\right)}$

( [link] ) If $z=\frac{x-u}{s}$ , find $z$ if $x=14$ , $u=20$ , and $s=2$ .

( [link] ) $\frac{1}{-{\left(-5\right)}^{-3}}$

( [link] ) $\frac{5x^3{y}^{-2}}{z^{-4}}$

( [link] ) $2^{-2}{m}^6{(n-4)}^{-3}$

( [link] ) $4a^{-6}(2a^{-5})$

( [link] ) $\frac{6^{-1}{x}^3{y}^{-5}{x}^{-3}}{y^{-5}}$

( [link] ) $\frac{{(k-6)}^2{(k-6)}^{-4}}{{(k-6)}^3}$

( [link] ) $\frac{{(y+1)}^3{(y-3)}^4}{{(y+1)}^5{(y-3)}^{-8}}$

( [link] ) $\frac{(3^{-6})(3^2)(3^{-10})}{(3^{-5})(3^{-9})}$

( [link] ) ${(a^4)}^{-3}$

( [link] ) ${\left[\frac{r^6{s}^{-2}}{m^{-5}{n}^4}\right]}^{-4}$

( [link] ) $\begin{array}{cc}{(c^0)}^{-2},& c\ne 0\end{array}$

( [link] ) Write $0.000271$ using scientific notation.

( [link] ) Write $8.90\times {10}^5$ in standard form.

( [link] ) Find the value of $(3\times {10}^5)(2\times {10}^{-2})$ .

( [link] ) Find the value of ${(4\times {10}^{-16})}^2$ .

( [link] ) If $k$ is a negative integer, is $-k$ a positive or negative integer?