Look at the expression below is an equivalent to 42X -56Y? Select yes or no for expressions A through D.
A. 7(6x-8y)
B. 40(2x-16y)
C. 14(x+2x+7y-3y)
D. 42(x+14y)

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 .