If for all real values of x, (x + c)(x + 4) = x2 + 8x + 4c, then c = ?

a. 2
b. 4
c. 6
d. 8
e. 10

16 more than the product of 5 and p

An energy drink company claims that its product increases students' memory levels. to support its claims, the company issues advertisements claiming that 8 out of 10 people (chosen randomly from across the country) who tried their product reported improved memory. the missing component in this study is a .

Afrequency table of grades has five classes (a, b, c, d, f) with frequencies of 3, 13, 14, 5, and 3 respectively. using percentages, what are the relative frequencies of the five classes?