Zvaries inversely with the product of x and y. when x=2 and y=4, z=0.5. what is the value of z when x=4 and y=9? , i've tried different things and i can't seem to get the correct answer. my choices are a: 45/2 b: 40/9 c: 40 d: 1/9

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 .

Acertain volume of water contains 100000 hydrogen atoms and 50,000 oxygen atoms how many hydrogen atoms are in a volume of water containing 4 million oxygen atoms

What is the score range for the smallest percent of students