d) Determine the geometric sequence whose \( 8^{\text {th }} \) term is 9 and whose \( 10^{\text {th }} \) term is 25 .

- Para ir del 23.98 al 24, ¿cuántas veces hay que sumar \( 0,01 ? \) ¿Y si le sumamos 0,001 ?

9FC \( 32,48,64 \)

6) Resolva as equaçães do \( 2^{\circ} \) grau, calculando as raizes: a) \( x^{2}-7 x+12=0 \). b) \( 4 x^{2}-36=0 . \frac{9}{2} \)

421 point The pH of pure water is because__ 14.0; water contains more \( \mathrm{OH}^{-} \)ions than \( \mathrm{H}^{+} \)ions 1.0; water contains more \( \mathrm{H}^{+} \)ions than \( \mathrm{OH}^{-} \)ions 7.0 ; water contains an equal number of \( \mathrm{H}^{+} \)ions and \( \mathrm{OH}^{-} \)ions 7.0 ; there are no ions formed in pure water 5 ; because pure water lacks minerals

\( C = \left. \begin{array} { c } { M ^ { 4 } R _ { 12 } } \\ { 4 x ^ { 2 } x ^ { - 3 } } \\ { 5 x ^ { 2 } x _ { 1 } } \\ { - 1221 } \end{array} \right. \)