A trinomial is a polynomial that has exactly three terms. Let's analyze the given expressions:
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\( x + 4y + 7 \) - This expression has 3 terms: \( x \), \( 4y \), and \( 7 \) (the constant term). This is a trinomial.
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\( x^3 + 11x^2 + x \) - This expression has 3 terms: \( x^3 \), \( 11x^2 \), and \( x \). This is also a trinomial.
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\( -x + y^{10} \) - This expression has 2 terms: \( -x \) and \( y^{10} \). This is not a trinomial.
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\( y^5 \) - This expression has 1 term. This is not a trinomial.
From the analysis, the expressions that are trinomials are:
- \( x + 4y + 7 \)
- \( x^3 + 11x^2 + x \)
So both of the first two expressions are trinomials.