You need to get x by itself. Add 6 to both sides.
x = 14
It should be 15. 88 minus 28 is 60. Then 60 divided by 4 is 15.
1. The combined volume of all the tanks at the aquarium is written in Scientific notation. Keeping this on mind, you can write it as following:

2. Now, you must sum the combined volume of all the tanks and the volume of the new tank to calculate the total volume of all of them:
3. Now, you can write the result in Scientific notation, as following:

The answer is: 
x = 51.98
Step-by-step explanation:
tan 68 = opp/hyp = x/21
or
x = 21×tan68°
= 21(2.475)
= 51.98
Answer:
Exponential Decay -
A quantity is subject to exponential decay if it decreases at a rate proportional to its current value.
Step-by-step explanation:
Hope this answered your question ^^