Pls help me with this logarithms​

What is the solution to the equation? k/6.4=8.7 2.3 5.568 15.1 55.68

Akid's pool is cylindrical and has a radius of 5 feet and a height of 2 feet. if a cubic foot holds about 7.48 gallons of water, how many gallons of water does the kid's pool hold? 21 gallons 52.3 gallons 1,174,4 gallons 157 gallons

Ratio of circumference to diameter example plz i need to now what it looks like.