Answer:
equation: 3.5x=31.5
number of hours: 9
Step-by-step explanation:
31.5/3.5=9
Therefore,
x=9, x=number of hours, number of hours=9
Answer:
Step-by-step explanation:
a=0 if both x and y are each =0
for all other real values a>0
Answer:
constant
Step-by-step explanation: