Six and forty-two ten-thousandths as a decimal

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

Write a story that matches with the expression 42x-5 pls hurry

White shapes and black shapes are used in a game. some of the shapes are circles. while the rest are squares. the ratio of the number of white shapes to the number of black shapes is 5: 11. the ratio of the number of white cicrles to the number of white squares is 3: 7. the ratio of the number of black circles to the number of black squres is 3: 8. work out what fraction of all the shapes are circles.