Can anyone find the value of the variables!

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base

Hannah paid $3.20 for 16 ounces of potato chips. hank paid $3.23 for 17 ounces of potato chips. who paid less per ounces?

What is the probably of getting heads when poing a coin and getting a number greater than or equal to 5 when rolling a single diea) 1/6b) 1/3c) 1/4d) 1/12