Im having trouble with these three questions

1. ) round $9.854 to the nearest dollar.

2.) round $56.9856 to the nearest cent.

3.) sierra is paid weekly salary of $550. how much does she earn in one year? (52 weeks in year)

Aclass consists of 55% boys and 45% girls. it is observed that 25% of the class are boys and scored an a on the test, and 35% of the class are girls and scored an a on the test. if a student is chosen at random and is found to be a girl, the probability that the student scored an ais

Equation for the calculation double 2 and then add 5

Find the equation of the ellipse with the following properties. the ellipse with foci at (0, 6) and (0, -6); y-intercepts (0, 8) and (0, -8).edit: the answer is x^2 over 28 + y^2 over 64 = 1