Simplify the expression with positive exponents only $\colon \frac{x^{-4}}{x^{-9}}$
$x^{5}$
300
Write this number in scientific notation $\colon 0.00000580$
$5.80\times 10^{-6}$
400
Simplify$\colon (7s^{4}t^{4})\cdot(5s^{2}t)$
$35s^{6}t^{5}$
400
Simplify the expression $\colon \left(\frac{3a^{3}b^{4}}{5a^{2}b^{3}}\right)^{2}$
$\frac{9a^{2}b^{2}}{25}$
400
Evaluate$ ( ka)^{e}$ for $k = 4, a = 5, e = 2$
$(4\cdot 5)^{2} = 4^{2}\cdot 5^{2} = 400$
400
Simplify the expression using positive exponents only $\colon \frac{2a^{4}b^{-2}}{4a^{-3}b^{-8}}$
$\frac{a^{7}b^{6}}{2}$
400
Simplify the expression using scientific notation $\colon\frac{24\times 10^{2}}{6\times 10^{9}}$
$4\times 10^{-7}$
500
An amount of bacteria DOUBLES in size every HALF HOUR. If there was $2,000$ bacteria at $12\colon 00$PM, how much bacteria grew exponentially at $3\colon 00$PM ?