(12) Andy is training for a race. He runs 3 days in one week. (a) On Monday, he runs \( 1 \frac{1}{2} \) miles. On Wednesday, he runs \( 1 \frac{2}{3} \) miles. On Saturday, he runs \( 1 \frac{1}{5} \) miles. Work out how far Andy ran in total. ( 7 marks for working out, 1 mark for answer \( =8 \) marks total)

¿Cuántos triángulos de diferente tamaño se pueden formar de modo que sus vértices sean puntos del arreglo?

Calculate the following integers using the number line given below \( +5+(-11)= \)

Utilice la regla de la cadena, para calcular: b) \( 3 \frac{\partial z}{\partial t}(1,1)+2 \frac{\partial z}{\partial s}(1,1) \), si \( z=\ln \left(x^{2}+y^{2}+9\right), \quad x(s, t)=s^{2}-5 t, y(s, t)=s+3 t^{2} \)

Determine whether the equation defines \( y \) as a function of \( x \). \( x^{2}+(y-1)^{2}=16 \)

\( - \frac { 5 } { 4 } + \frac { 3 } { 4 } = - 1,25 + \cdots \cdots = \frac { n } { 4 } = \frac { \cdots + 3 } { 4 } \)