The base of a 15-foot ladder is 6 feet from a building. If the ladder reaches the flat roof, how tall is the building?
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<h3>The terms 4x and 5y has different variable present in it. 
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<em><u>Solution:</u></em>
Given that,
<em><u>The reason is:</u></em>
When we are adding terms which has exactly the same variables, we must add the constants and let the result stand with variable
Which means,
4x + 10x = 14x
But,
We cannot add terms that has different variable
Which means,
4x + 5y
Here, both the terms 4x and 5y has different variable present in it. Hence they cannot be added together