i have tried these many times and still can't get them.

1) f(x)= ((5x^3)-(5x^2)+9x-9) / (x-1) when x < 1

f(x)= (6x^2)-1x+a when x>=1

What value isato make the function continuous at 1?

I tried making them equal to each other and putting x=1 but that didn't work.

2) (e^2x) - (7e^x) + 6 = 0

It says there are 2 solutions but I keep getting -33.1255 and that's not even one of them.

3) y=loga(x) with the subscript beinga. It passes through (28,1).

What is the value ofa?

I have no idea what to do on this one.

4) log2(x) + log2(x+3) = k

Solve for x in terms of k.

Again, I have no idea what to do. I can solve it if k is an integer but thats about it.

Any help is greatly appreciated.