In a recent year, the population of california was about 2.52 x 10^7 people. its land area is about 4.05 x 10^5 km^2. what was the average number of people per square kilometer? write your answer in scientific notation. i need

Mrs. blake's bill at a restaurant is $42.75. she wants to leave the waiter an 18% tip. how much will she pay in all, including the tip?

The john nash mall used 17,4000 kilowatt hours in may, with a peak load of 92 kilowatts. the demand charge is $5.95 per kilowatt, and the energy charge is $0.08 per kilowatt hour. the fuel adjustment charge is $0.017 per kilowatt hour. what is the total electricity cost for may?

What is number 31 as a sum of tens and ones?