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danielasena21
20.09.2019 •
Mathematics
Afarmer looks out into the barnyard and sees the pigs and the chickens. he says to his daughter, "i count 153 heads and 346 feet. how many pigs and how many chickens are out there? "
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Ответ:
There are 20 pigs and 133 chickens.
Step-by-step explanation:
We know that a pig has 4 legs and a chicken has 2 legs.
Let x be the number of pigs and y be the number of chickens , then we have the following system of linear equations:-
Multiply 2 on both sides of equation (1), we get
Eliminate equation (3) from equation (2), we get
Put x= 20 in (1), we get
Hence, there are 20 pigs and 133 chickens.
Ответ:
We can visualize skydivers A, X, and B as corresponding to three coordinates -2.5, 0, and 0.5, respectively.
To find the distance from A to B, we can just take the absolute value of the different between their coordinates.
|-2.5 - 0.5| <-- this is the expression
|-2.5 - 0.5| = |-3| = 3 <-- this is the distance