Plz help me with these 2 questions my test is out in 10 mins

The price of an item has been reduced by 30%. the original price was $30. what is the price of the item now ?

Ten times the square of a non-zero number is eqaul to ninety times the number

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 .