Actividad 5 Encontrar los valores de \( k \) para que 1) La ecuación \( k^{2}(x-1)=2 k(x+1) \), tenga infinitas soluciones 2) La inecuación no tenga solución \( 2 x^{2}+k

Calculate the circumference and the area of a circle with a) radius 83 cm b) diameter 257 mm .

Scientists are studying the temperature on a distant planet. Let \( y \) represent the temperature (in degrees Celsius). Let \( x \) represent the height above the surface (in kilometers). Suppose that \( x \) and \( y \) are related by the equation \( 46-3 x=y \). Answer the questions below. Note that a change can be an increase or a decrease. For an increase, use a positive number. For a decrease, use a negative number. What is the temperature change for each kilometer we go up from the surface? What is the temperature on the surface of the planet?

4) \( -7(2+5 r) \)

\[ \frac{6 x-4 y}{5}=2 \] Step 2 of 3: Evaluate the function found in the previous step at \( x=-2 \)

\( y = \frac { a x + b } { c x + d } \)