Answer:
Step-by-step explanation:
I'm going to write it so I can see it better:
You can use the difference of squares formula:
4 ft , 16 ft & 20 ft
40 = x + 4x + 5x = 10x --> x = 4
yes
If each whales weighed
Then 30 whales weighed
Applying the law of indices we obtain
3x = 9.2 ⇒ x = 2.02000606