Hey guys! help me out thanks! due in 5 minuets

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

Me d is also an option but i couldn't get it in the picture

The population of a bacteria colony grows by a consistent percentage each hour and can be modeled by the function y = 500(1.16)t. what does the value 500 represent in the function?