Find the value of x.

Can someone help please?

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

You are at a restaurant and owe $38 for your meal. you want to leave a 20% tip. how much will your tip be?

At a kentucky friend chicken, a survey showed 2/3 of all people preferred skinless chicken over the regular chicken. if 2,400 people responded to the survey, how many people preferred regular chicken?