3 Plotëso barazimet \( \frac{2}{5}+\frac{\ldots}{\ldots}=\frac{4}{5} \)

8 En vektor \( \vec{u}=(3, b) \) har längden \( \sqrt{13} \) l.e. Bestäm talet \( b \).

UMEROS REALES: 1) Resuelve extrayendo factores de los radicales \( \begin{array}{ll}\text { a) } \sqrt{48}+\sqrt{27}= & \text { b) } 9 \cdot \sqrt{12}-2 \cdot \sqrt{75}=\end{array} \)

a) \( \sqrt{48}+\sqrt{27}= \)

A sewage treatment plant discharges a pollutant with a concentration of \( 18 \mathrm{mg} / \mathrm{L} \). The plant's total discharge is 0.15 MGD (millions of gallons per day). Determine the rate of pollutant released in pounds day. Give your answer accurate to at least two decimal places.

Work out the \( n \)th term of the following number patterns. a) \( 2,4,6,8, \ldots \) b) \( 3,5,7,9, \ldots \) c) \( 5,8,11,14, \ldots \) d) \( 1,5,9,13, \ldots \) e) \( 12,22,32,42, \ldots \) f) \( 2,8,14,20, \ldots \) g) \( 3,4.5,6,7.5, \ldots \)