<span>An equation that is satisfied for every value of the variable for which both sides are defined is called an identity.
For example:
Given the equation
3x + 4 = x + 2(x + 2)
Notice that for any value of x you use, the equation is true.
Thus, this type of equation is called an identity.
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Answer:
4
Step-by-step explanation:
To find the number you have to reverse the equation
Let us call the number "x"
x + 9 = 13
So to find x we flip the equation
13 - 9 = x
Solve it
4 = x
So the missing number is 4
C.,E
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The elephant lost 4 pounds each month. Because he is losing weight, and not gaining weight, you have to make the answer negative
Answer:
10 miles.
Step-by-step explanation:
Let x be the number of miles on Henry's longest race.
We have been given that Henry ran five races, each of which was a different positive integer number of miles.
We can set an equation for the average of races as:
As distance covered in each race is a different positive integer, so let his first four races be 1, 2, 3, 4.
Now let us substitute the distances of 5 races as:
Let us multiply both sides of our equation by 5.
Let us subtract 10 from both sides of our equation.
Therefore, the maximum possible distance of Henry's longest race is 10 miles.