Please help and explain your steps by step

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 .

What is the absolute value of the complex number -4-sqrt2i

What is the measure of ac? 5 units 13 units 26 units 39 units 3x- 2b 6x + 9