What are the coordinates of the endpoints of segment \( M^{\prime} N^{\prime} \) ? \( M^{\prime}(-6,9) \) and \( N^{\prime}(4,9) \) \( M^{\prime}(-6,9) \) and \( N^{\prime}(3,9) \) \( M^{\prime}(-2,3) \) and \( N^{\prime}(7,9) \) \( M^{\prime}(-2,3) \) and \( N^{\prime}(1,3) \)

Evalúa \( x-(-y) \), donde \( x=-2.31 \) y \( y=5.9 \)

(1) RAZONAMIENTO. Escribir los términos que hacen ver- dadera la igualdad. \( \begin{array}{ll}\text { 28. }(2) \times(23)=\square & \text { 29. }(-8) \times(-9)=\square \\ \text { 30. } \square \times(-7)=-42 & \text { 31. } 3 \times \square=33 \\ \text { 32. } 9 \times \square=-27 & \text { 33. } \square \times(-3) \times(\square)=9 \\ \text { 34. }(-5)(-3) \times \square=45 & \text { 35. }(-9) \times \square \times(-1)=36 \\ \text { 36. } \square \times \square \times \square=81 & \text { 37. }(-1) \times \square \times \square=-18\end{array} \)

The lengths of the rectangle have been measured to the nearest tenth of a metre. Work out the following, writing down all the figures on your calculator display: a) The upper bound for the perimeter of the rectangle. b) The lower bound for the area of the rectangle. 15.8 m

The polynomial function \( f \) is defined by \( f(x)=-3 x^{4}-7 x^{3}+3 x^{2}+9 x-1 \). Use the ALEKS graphing calculator to find all the points \( (x, f(x)) \) where there is a local minimum. Round to the nearest hundredth. If there is more than one point, enter them using the "and" button. \( (x, f(x))=\left(\prod_{1}, \square\right) \)

Find \( \frac{1}{4} \div \frac{2}{9} \)