PLZ HELP DOING MY FINALSS Calculate the following:

4.0 x 10¹⁴ x 7.0 x 10¹³
(show working)

You paid 28.00 for 8 gallons of gasoline. how much would you pay for 15 gallons of gasoline?

Acar started driving from city a to city b, distance between which is 620 miles, at a rate of 60 mph. two hours later a truck left city b and started moving towards city a at a rate of 40 mph. how many hours after the truck's departure will the two meet?

Determine if the equation defines y as a function of x: 2xy = 1. yes o no