Hi there!
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I believe your answer is:
[tex]y^{28}[/tex]
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Here’s why:
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[tex]y^{17} * y^{11}\\\rule{150}{0.5}\\\text{Note the exponent rule: } a^x + a^y = a^{x + y}\\\rule{150}{0.5}\\y^{17} * y^{11} = y^{17 + 11} = \boxed{y^{28}}[/tex]
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Hope this helps you. I apologize if it’s incorrect.
