help with these math problem(s)?

How long will it take for $1,000 to be worth $3,500 at 7% interest, compounded continuously

Solve the following equation for x:

log3x=3

Write the expression as a single logarithm:

1/5logx−5logy−5logz=log

Julius N2014-05-18T08:28:32Z

17.896613835648115 years

x= 1000/3= 333.33333333
log(3x)= 3