Work out the value of (root99-root11)^2 URGENT

Which logarithmic equation is equivalent to the exponential equation below? e^a=55(you will receive 34 points)

Find the perimeter of the figure shown above. a. 18 yds c. 20 yds b. 10 yds d. 24 yds select the best answer from the choices provided

Aclassmate thinks that solving a system by graphing gives an exact answer when the lines appear to cross at a grid point, but only an approximate answer when they don't. explain why this isn't true.