Which of these is a mathematical expression? A
B
4 - 3r

C
4 - 3r = 1

D
“Happily ever after”

4 - 3r

Step-by-step explanation:

D is just a statement of words, completely unrelated to math. C is an equation since because of the product and equal sign. hope that makes sense.

B) 4-3r is a mathematical expression.

( - 4 , -7 )

all the lines must parallel  

step-by-step explanation:

coordinates of c = ( - 1 , 2 )

3 units left = ( -4 , 2 )

9 units down = ( - 4 , 11 )

step-by-step explanation:

for volume, add base x height x width