I need help , could you help?

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 .

At your job you're paid $50 per week plus $3 per sale at least how many saled do you need to make in order to have over $250

An object moves according to the law s = t2 + 5t - 8. what is the average rate of change of s with respect to t in the interval t to (t + △ t)? a. 2t + 5b. 2t + 6c. 2t + (△t)2 + 5△td. 2t + △t + 5