Chenoa starts with $250 in her savings account. each month she adds $15. which recursive function rule models the total amount in chenoa’s savings account at the end of each month? a)an=15⋅an−1 and a1=250 b)an=15+an−1 and a1=250 c)an=250+an−1 and a1=15 d)an=250⋅an−1 and a1=15

There is a line with slope 1/a going through the point (a, a²). find the equation of the line perpendicular to this line at this point. (don’t let this problem intimidate you! solve the problem as you would if i’d given you specific values. just use variables instead.)

Use the elimination method to solve the systems of equations.choose the correct ordered pair. 7x+4y=39

1. why is a frequency distribution useful? it allows researchers to see the "shape" of the data. it tells researchers how often the mean occurs in a set of data. it can visually identify the mean. it ignores outliers. 2. the is defined by its mean and standard deviation alone. normal distribution frequency distribution median distribution marginal distribution 3. approximately % of the data in a given sample falls within three standard deviations of the mean if it is normally distributed. 95 68 34 99 4. a data set is said to be if the mean of the data is greater than the median of the data. normally distributed frequency distributed right-skewed left-skewed