Exercise 31

Simplify each expression, if possible, by combining like terms.

  1. \({{\frac{8}{9}}z^{2}+{\frac{4}{7}}t^{2} - {\frac{7}{2}}z}\)

  2. \({-{\frac{2}{5}}x^{2}+{\frac{8}{9}}y^{2}-{\frac{7}{3}}}\)

  3. \({6t^{2} - {\frac{2}{9}}t^{2}}\)

  4. \({-{\frac{7}{2}}t^{2}+{\frac{5}{2}}t}\)

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