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Select all the correct answers. what is 221,000,000,000,000,000,000 expressed in scientific notation?

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?

If tan2a=cot(a+60), find the value of a, where 2a is an acute angle