Question

1)

Answer 1

Part 1) we know that
Volume of rectangular prism=L*W*H-------> 3*6*4-----> 72 units ³
and 
Volume of rectangular prism=Area of the base*H
Area of the base B=L*W------> 3*6----> 18 units²
so
Volume of rectangular prism=18*4-----> 72 units³

the answer Part 1) is the option
 C) V=Bh

Part 2) we know that
Volume of rectangular prism=L*W*H-------> 5*2*3-----> 30 units ³
and 
Volume of rectangular prism=Area of the base*H
Area of the base B=L*W------> 5*2----> 10 units²
so
Volume of rectangular prism=10*3-----> 30 units³

the answer Part 2) is the option
 C) V=Bh

Part 3) we know that
Volume of rectangular prism=B*H
B=area of the base--------> 5*3-----> 15 units ²
H=3 units
Volume of rectangular prism=15*3-----> 45 units³
and 
Volume of rectangular prism=L*W*H
Volume of rectangular prism=5*3*3-----> 45 units³

the answer Part 3) is the option
C) V=LWH 

Part 4) Part 3) we know that
Volume of rectangular prism=B*H
B=area of the base--------> 5*5-----> 25 units ²
H=7 units
Volume of rectangular prism=25*7-----> 175 units³
and 
Volume of rectangular prism=L*W*H
Volume of rectangular prism=5*5*7-----> 175 units³

the answer Part 4) is the option
C) V=LWH