I need help with number 2.

The triangles are similar. what is the value of x? show your work.

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?

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 .