The following table represents a linear relationship . Answer the questions about this table​

Li buys supplies so he can make and sell key chains. he begins to make a profit only after he sells 4 key chains. what point on the graph makes the most sense in this situation?

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

Louis wants to carpet the rectangular floor of his basement.the basement has an area of 864 square feet.the width of the basement is 2/3 it's length. what is the length of louis's basement