Answer:
option (a) and (d) is correct.
Step-by-step explanation:
Given : To bill customers for water usage, one city converts the number of gallons used into units.
This relationship is represented by the equation g = 748u
where, g is the total number of gallons of water used and u is the number of units.
We have to check out of given options which statement about the relationship is true.
Since, given relationship is g = 748u.
We can put any value of u and find the corresponding value of g at that u.
For example
Since, u is the number of units used Let it be 30 units.
Then , we can find g , the total number of gallons of water used
By the relationship as g = 748u
Putting u = 30 , we get g = 748(30) = 22440 gallons.
So, here g depends on u and u is independent variable.
Thus, option (a) and (d) is correct.
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