Standard form of an exponential function is y=ab^x
when x=0, y=3, 3=ab^0, so you can figure out that a=3
when x=-1, y=6, 6=3b^(-1), b^(-1)=2, b=1/2
so the equation is y=3(1/2)^x
11/16 is greater so 5/8 is less
You got it correct
about + - 10.4
Standard form would be 1.46e-6 because the variable has one degree and the number 6 does not have a degree.
$1.79 i hope this helps you