Can someone me a still don't get this

The volume of a sphere is increased by 6%. calculate the corresponding percentage increased in it area.

What is the simplified form of (3.25x10^3)(7.8x10^6) written in scientific notation?

One astronomical unit (1 au) is about 1.496 alt tag missing. kilometers. if you wrote this number of kilometers in regular decimal notation (for example, 528 and 3,459 are written in regular decimal notation), how many zeros would your number have?