Kelvin starts to save for his son's university education when he is in grade 8. At the end of January he deposits R13 000 into a savings account that offers \( \mathbf{1 3 , 5 \%} \) interest p.a. He estimates that university will cost R9 500 payable at the end of January in the first year and will escalate at \( \mathbf{1 0 \%} \) p.a. Determine: a) The fees for the second and third year. b) The additional amount that Kelvin will have to pay to cover his son's third year in university.

- \( a^{2}+a-380 \)

\( \left. \begin{array} { l } { 789.6 .43 } \\ { \times 2.23 } \\ \hline \end{array} \right. \)

draw the following function \( y=3 x+4 \)

Encuentre (sin resolver la ecuación) la región en el plano cartesiano donde se salisfacen la hipótesis del teorema de existencia y unicidad y por tanto, existe una solución única que pasa por cada punto dado en esta región: \[ \begin{array}{ll}\text { a) } \frac{d y}{d x}=\frac{(\cot x) y}{1+y} \\ \text { b) } \frac{d y}{d x}+2 y=0 \\ \text { c) } y^{\prime}+2 x y=x^{3} \\ \text { d) } x y^{\prime}+(1+x) y=e^{-x} \operatorname{sen} 2 x \\ \text { es } \cos ^{2} x \operatorname{sen} x \frac{d y}{d x}+\left(\cos ^{3} x\right) y=1\end{array} \]

Given an array of integers of size 5 , how does the computer knew where the \( 3^{\text {rd }} \) indexed variable is located? It adds space for 3 integers to the base address of the array, It adds 3 to the base address of the array, It remembers where all the indexed variables of the array are located. None of these