4n + 8 = 20 Which value of n from the solution set 3, 8, 10, 12) will make the equation true? A 3
B 8
C 10
D 12​

This is geometry. could anyone ? i can't fail this class. my grade is quite low already.

Use the diagonals to determine whether a parallelogram with vertices u(2,−2), v(9,−2), w(9,−6), and x(2,−6) is a rectangle, rhombus, or square. give all the names that apply.

What is 20+(5 x 2/5 )+ 3 show your work