When adding or subtracting fractions, multiply to get the same denominator (bottom number).
[tex] \frac{4}{5}*( \frac{4}{4}) - \frac{1}{4} * (\frac{5}{5} ) = \frac{16}{20} - \frac{5}{20} = \frac{11}{20} [/tex]
When multipling two fractions, just multiply straight across, factor diagonally if possible.
[tex] \frac{7}{13} * \frac{5}{6} = \frac{35}{78} [/tex]
When dividing fractions, flip the second fraction over and multiply.
[tex] \frac{13}{17} / \frac{3}{2} = \frac{13}{17} * \frac{2}{3} = \frac{26}{51} [/tex]
For the polynomials, you just need to combine like terms.
3x + 4y² + 7x + 6y² = (3x + 7x) + (4y² + 6y²) = 10x + 10y²
You can factor this further but I don't know if its necessary.
= 10(x + y)
Let me know if you have any questions.
