In a random sample of 40 students, the mean
daily time spent using a cell phone was 3.15 hours
with a standard deviation 1.08. construct a 90%
confidence interval for the population mean.
a) 2.87 < u < 3.43
(2.712m43.59
b) 2.82 d) 1.376m 24.93

What values of x satisfy the inequality x^2-9x< 0? how is your answer shown on the graph?

Draw a tape diagram to represent each situation. for some of the situations, you need to decide what to represent with a variable andre bakes 9 pans of brownies. he donates 7 pans to the school bake sale and keeps the rest to divide equally among his class of 30 students

1) in triangle the, what is the measure of angle t (in degrees)? 2) in triangle bat, the measure of angle b is 66∘, and the measure of angle t is 77∘.what is the measure of the exterior angle at a (in degrees)?