Jodi is considering taking online classes at two websites, learncenter and eduworld. each site requires that students pay
a base membership fee, plus they charge a rate per class. the two graphs show the cost for taking online classes through
the two websites

Describe in detail how you would construct a 95% confidence interval for a set of 30 data points whose mean is 20 and population standard deviation is 3. be sure to show that you know the formula and how to plug into it. also, clearly state the margin of error.

Atemperature of 1.64◦f corresponds to answer in units of ◦c.

Aquadratic equation in standard from is written ax^2= bx+c, where a,b and c are real numbers and a is not zero?