Answer:
-4x-y=24......1
24−4x−y=24
substituting value of−4x−y
24-24=24
it has no solution. I think question is incomplete
Answer: Option 'A' is correct.
Step-by-step explanation:
Since we have given that
The ocean floor directly beneath the boat is at a depth of = 180 meters
Submarine is at an elevation when it is above the ocean's surface = 2 meters
Total distance submarine needs to descends at a constant rate = 180+2=182 m
Rate of submarine descends = 0.4 meters per second.
Time taken by a scientist spend descending after boarding the submarine is given by

so, it must be less than 455 seconds.
therefore, it becomes x<455.
Hence, Option 'A' is correct.
Answer:
80,60
Step-by-step explanation:
formula for percentage error is (actual value /absolute error)
X+y/2
9.6+3.60/2 = 11.4,,
N(20/100)(20/100)=20
n(1/5)(1/5)=20
n/25=20
n=500