The circumference of a circle is 25.12 miles. what is the circle's diameter? c=25.12 mi use 3.14 for pi

What is the simplified form of (3.25x10^3)(7.8x10^6) written in scientific notation?

Solve each quadratic equation by factoring and using the zero product property. n^2 - 49 = 0

Astudy of 80 english composition professors showed that they spent, on average, 14.6 minutes correcting a student's term paper. construct and interpret a 90% confidence interval of the mean time for all composition papers. assume that the population standard deviation is 2.9 minutes. round to 1 decimal.