Remark
Let the pigs = p
Let the chickens = c
Givens
30 heads is another way of saying that there were 30 creatures in the barnyard. In addition each chicken has 2 legs and each pig has 4
c + p = 30
2C + 4P = 100 (2) Divide (2) by 2
C + 2P = 50 (3) Subtract (1) from (3)
<u>C + P = 30</u>
P = 20
So there were 20 pigs.
7x + 2y = 48
7x + (2x3) =48
7x + 6 = 48
7x = 48 - 6
7x = 42
--> x = 6
When the two angles add to 180 grades, we say they "supplement" each other.
The mean of data is Sally's prediction which is congruent to her cat's weigh:
mean=average weight= (13.5+12.5+10.5+11.2+11.2+10.8+9.5+13.4+11.5+11.8)/10= 11.59 lb is the answer