How do you turn 0.000619 into scientific notation

Determine the difference: 3.2 × 1010 – 1.1 × 1010. write your answer in scientific notation.

Atheater wants to build movable steps that they can use to go on and off the stage. they want the steps to have enough space inside so they can also be used to store props. how much space is inside the steps?

Identify the initial amount a and the growth factor b in the exponential function. a(x)=680*4.3^x