We Need To Use Order Of Operations.
5-2 = 3.
32+3 * 4 - 6
-----------------
3
3*4 = 12
32 + 12 - 6
---------------
3
32+12 = 44.
44 - 6
38
--- = 12 and 2/3
3
So, This Expression Is Equal To 12 and 2/3
X+x+1+x+2+x+3=50
4x+6=50/-6
4x=50-6=44
x=44:4=11
⇒The 1st number is 11, the 2nd is 12, the 3rd is 13 and the 4th is 14.
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11+12+13+14=50
If you don't understand something,please ask me.
expression is equivalent to 
We apply exponential property
Multiply the outside exponent 1/2 with exponents inside the parenthesis
1/4 times 1/2 is 1/8
16 times 1/2 is 8
so expression becomes
So the answer is
Ducks have 1 head. Dogs have 1 head.
Ducks have 2 feet. Dogs have 4 feet.
If x = no. of ducks and g = no. of dogs
x + g = 25
2x + 4g = 80
Let's use substitution to solve.
x + g = 25 ⇒ x = 25 - g
replace x with 25 - g in the other equation and solve for g
2x + 4g = 80
2(25 - g) + 4g = 80
50 - 2g + 4g = 80
50 + 2g = 80
2g = 30
g = 15
Now use g = 15 in an earlier equation to find x.
x + g = 25
x + 15 = 25
x = 10
