Find last years salary if, after a 5% pay raise, this year's salary is $40,425

Which best explains why this triangle is or is not a right triangle?

Can someone check if i did this correct. it’s number 4 if you’re wondering.

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 .