Help me please I genuinely don't know exactly what to do ​

In right ∆abc shown below, the midpoint of hypotenuse ac is located at d and segment bd is drawn.if ab = 12 and bc = 16, then explain why bd = 10. hint: consider what you know about the diagonals of a rectangle.

How do you write something in scientific notation?

Solve the system of equations using the substitution method. {y=−3x+7x=−2y−16 enter your answers in the boxes.