Find the perimeter and area of the following rectangle

Evaluate the expression for the given value of the variable 2×(c2-5) for c=4

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 .

Which steps could be part of the process in algebraically solving the system of equations, y+5x=x^2+10 and y=4x-10