Answer:
7.8
Step-by-step explanation:
the answer is

V= m/d. When you get questions asking about density/mass/volume draw a triangle just like in the picture i have attached and with your finger cover up the one you are looking for. So to find the equation for volume you cover up volume and you are left with mass divided by density.
You’re supposed to put A on 1,-1
Q (2,-3) R (4,-3)