What does .3 equal to this a really easy question of a 4th grader?

Select the margin of error that corresponds to the sample mean that corresponds to each population: a population mean of 360, a standard deviation of 4, and a margin of error of 2.5%

Frank owns a $141,000 home, for which he has a 30-year mortgage in the amount of $700 a month. once he has paid off mortgage, how much will he have paid in investment? a. $111,000 b. $109,000 c. $120,000 d. $141,000

In the diagram, ab is tangent to c, ab = 4 inches, and ad = 2 inches. find the radius of the circle.