Help me with log word problem ​

Susie wants to take her friend out for lunch.she wants to spend $9.75 each person. how much will she spend in all.

What is the surface area of a cube with the volume of 729 ft?

Harry owes the bank money. to repay his debt, he paid $150 back to the bank each month. after 10 months, his remaining debt was $6900. what was the original amount of harry's debt? how long did it take harry to pay back his entire debt?