Use the quadratic formula to solve the equation-x^2+7x-9=0

On average, how many more hits will he get when he bats 100 times at home during the day as opposed to 100 times away at night?

Ineed me i stuck and i don’t want to get it wrong

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 .