The sun produces 3.9 ⋅ 10^33 ergs of radiant energy per second. how many ergs of radiant energy does the sun produce in 3.25 ⋅ 10^3 seconds?

1.2675 x 10^35 is the answer. the x10^ whatever means you take the decimal point and move it to the right that many places and add zeros when you run out of numbers so usually i just count the numbers after the decimal point and subtract that from whatever power the ten is raised to and if the power is negative you move the decimal backwards adding zeros when you run out of numbers. so you change the first number to standard form then multiply by the other number in standard form and the calculator will put it in scientific notation for you but beware it uses a different form instead of the x10 format it puts the number followed by an e + whatever power it's supposed to be multiplied by and if its negative it will say - whatever power its multiplied by. :)