Answer:

Step-by-step explanation:
Answer:
B
) Negative
Step-by-step explanation:
Given the expression 3xy
when x>0 and y<0
The value of the expression 3xy will be negative.
This is because the product of a positive and negative number will always be negative.
For illustration,
Let x=5>0 and y=-5<0
3xy=3(5)(-5)=-75
NOTE:

Answer:
x>0 and y>0
Step-by-step explanation:
1= ++ 2= -+ 3= -- 4= +-
If Ava waters her lemon tree 12 times, then she has used 10.667 gallons of water.
<u>Solution:</u>
Given that , Ava uses
gallons of water every time she waters her lemon tree.
If she waters her lemon tree 12 times, we have to find how much water will she use
Total water used = water used for 1 time
number of time water used for plants
Here water used for one time = 
Number of time watered = 12


Hence, Ava used 10.667 gallons of water.