Please help me i do not want to fail my class
2 answers:
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Try this solution:
Answer: 6 & 4.5 (m-per-h)
Step-by-step explanation:
- The basic formula used in this task is S=V*t, where S - distance, V - speed, t - time.
- the downstream speed is: V+Vc, where V - the speed of the boat in still water, Vc - the speed of the current.
- the upstream speed is: V-Vc.
- according to the described above the distance for downstream is S1=(V+Vc)*t1, where t1=10; the distance for upstream is S2=(V-Vc)*t2, where t2=70.
- for whole travel down- and upstream: S=S1+S2.
- Using these it is possible to make up the system of the equations:
V - the speed of the boat in still water - 6 miles per hour, Vc - the speed of the current - 4.5 miles per hour. All the details for the system of the equations are in the attachment.
Answer: Park P
Step-by-step explanation:
Since, According to the question,
Number of yellow bird in park P = 33
Total number of the bird in park P = 53
Thus, the percentage of yellow bird in park P = = 62.264150943% ≈ 62 %
Number of yellow bird in park Q = 20
Total number of the bird in park Q = 48
Thus, the percentage of yellow bird in park P = =41.666666666% ≈ 42%
Number of yellow bird in park R = 54
Total number of the bird in park R = 90
Thus, the percentage of yellow bird in park R = = 60 %
Number of yellow bird in park S = 44
Total number of the bird in park S = 83
Thus, the percentage of yellow bird in park P = =53.012048192 % ≈ 53 %
Since, 62% > 60% > 53% > 42%
Therefore, highest percentage of the yellow bird is 62 %
Which is present in park P.