D) 48
2 packs of plates is 48 plates and 3 packs of cups os 48 plates.
The first working out is correct, z = 3
Answer:

Step-by-step explanation:
The systems of equations are
Let us assume the rate of the current be c
Now actual speed against the current is (15 - c)
And, the actual speed with the current is (15 + c)
Here we applied the time formula i.e. distance by speed
Also the upstream time - downstream time = 4
Now the equations are

The correct answers are:
1. 35
2. B.) Rational
3. -88/3 or as a decimal, 29.3 repeating
4. 226.981
5. -6
Hope This Helps!!!
Can I have Brainliest?
Answer:
n
Step-by-step explanation:
-12n - (-13n) = -12n +13n = 1n