Uma loja de esportes tinha 5 caixas, cada uma conten diversas bolas de futebol e basquete. Depois que 15 bole de futebol e algumas bolas de basquete foram ve didas, 18 bolas permaneceram nas caixas. Se cada caixa cor ha 12 bolas antes da venda, quan bolas de basquet oram vendidas?

15. \( \frac{4}{9}+\frac{6}{18}+\frac{4}{3}=\frac{1}{3} \)

3. simplify \( \frac{x+7}{x-7}-\frac{5 x+35}{x^{2}-49} \)

14. \( 1 \frac{4^{3}+4^{3}+4^{3}+4^{3}}{2^{3}+2^{3}}= \) A. 2 B. 4 C. 8 D. 16

Sarah is hiking on a trail near her home. She traveled 5 miles before stopping for a break. After the break, Sarah plans on increasing her speed to 3 miles per hour. Which equation models the total distance, \( D \), Sarah travels after hiking for an additional \( h \) hours? A. \( D=3 h-5 \) B. \( D=3 h+5 \) C. \( D=3(h-5) \) D. \( D=5 h+3 \)

\( A=\left(\begin{array}{ccc}1 & 4 & -4 \\ 2 & 2 & 0 \\ -1 & 1 & 2\end{array}\right): B\left(\begin{array}{cc}6 & 4 \\ 4 & 5 \\ 3 & -4\end{array}\right) ; C=\left(\begin{array}{ccc}3 & 4 & 6 \\ 1 & -2 & 0\end{array}\right) ; D=\left(\begin{array}{ccc}6 & 7 & 0 \\ 3 & -2 & 4 \\ 0 & -1 & 0\end{array}\right) \), algebraicas correspondientes según el literal ealice las operaciones alonado \( v \) obtenga la matriz \( u \).