In a local university, 40% of the students live in the dormitories. a random sample of 80 students is selected for a particular study. the probability that the sample proportion (the proportion living in the dormitories) is between 0.30 and 0.50 is

In trapezoid efgh, m∠hef=(4x2+16)∘ and m∠gfe=(5x2+12)∘. find the value of x so that efgh is isosceles. i'm desperate.

The owners of four companies competing for a contract are shown in the table below. if a report is released that advocates company b, which of the people having funded the report should result in the most skepticism? company owner of company company a jake adams company b company c company d debby smith henry rose rhonda baker o a. jake adams o b. rhonda baker o c. debby smith o d. henry rose

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?