Question 186458
{{{(2/3)^-2*(4/5)^-1}}}
If you don't get negative exponents, just think of them 
like this:
10^4 = 10000
10^3 = 1000
10^2 = 100
10^1 = 10
10^0 = 1
10^-1 = .1
10^-2 = .01
10^-3 = .001
10^-4 = .0001
In general, {{{x^(-a) = 1/(x^a)}}}
{{{(2/3)^-2*(4/5)^-1}}}
{{{(1/(2/3)^2)*(1/(4/5)^1)}}}
{{{(1/(4/9))*(1/(4/5))}}}
Now you just invert each fraction
{{{(9/4)*(5/4)}}}
{{{45/16}}} answer