There are 50 seashells on the beach after one week there are 120 seashells on the beach if this continues the same patterns how many seashells will there be on the 4th week

Impossible to know from facts given. Maybe 192 or 320

Step-by-step explanation:

The difference between the original number, 50 and the week later 120 is 70

One way to predict the following two weeks might be to look at the the difference between the first deposit and the second deposit and predict that the amount added will increase by the same amount. That difference is 20.

50 + 70 + 90 + 110 = 320.

Another way is to look at the percentage of the increase and use that rate to predict the subsequent deposits,

The increase from the first week to the second week is 70/50. That is 1.4 or an increase of 140%. If that rate continues, the amounts are different.

50 x 1.4 = 70   70 x 1.4 = 98  98 x 1.4 = 137.2  137.2 x 1.4 = 192.08

This entire problem is suspect! There is no punctuation. And who can ensure that the beach won't be disturbed by a storm that washes away the shells or beachcombers who collect them?

54 km / hours

step-by-step explanation:

we need to convert seconds to hours

60 seconds = 1 minutes

60 minutes = 1hour

15 m         60 second   60 minutes

  * *         = 54000 meters/ hour

second     1 minute             1 hour

now we need to convert meters to km

1000 m = 1 km

54000 m       1 km

*   = 54 km / hours

hour               1000m