Can y’all please help me with this bonus question

Write the equation in logarithmic form 8^x=64

Afactory buys 10% of its components from suppliers b and the rest from supplier c. it is known that 6% of the components it buys are faulty. of the components brought from suppliers a,9% are faulty and of the components bought from suppliers b, 3% are faulty. find the percentage of components bought from supplier c that are faulty.

If the circumference of the circle is below 72, what is the length of ab (the minor arc)