9.931 times 10 to the 5th power. write in standard form

Two streets intersect at a 30- degree angle. at the intersection, the are four crosswalks formed that are the same length. what type of quadrilateral is formed by the crosswalks?

You are a clerk at convenience store. a customer owes 11.69 for a bag of potatoes chips. she gives you a five dollar bill. how much change should the customer receive?

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