Find (1.6×10^7)+(3.8×10^8). Express your answer in scientific notation.

The heaviest 16% of all men in weight weigh more than how many pounds ?

The classrooms are trying to raise $1,200.00 for charity. mrs. leblanc's class has raised 50%. mr. patel's class has raised $235.14 ms. warner's class has raised 1/3 as much as mrs. leblanc's class. how much more money is needed to reach the goal of $1,200.00?

Could somebody me with this radical simplification?