6. Mike is \( x \) years old and Naomi is \( y \) years old. (a) Write down what is represented by the expression \( y-x \). (b) Their ages are connected by the equation \( y=2 x-7 \) Naomi is 37 years old. Find the sum of Mike's age and Naomi's age.

\( \int _ { 1 } ^ { + \infty } x ^ { - 3 / 2 } d x \)

5. Si se introduce un consumidor secundario a la siguiente cade alimenticia, ¿con cuál de los organismos mostrados compet directamente?. Escriba su respuesta a continuación. Huiros \( \rightarrow \) Lapas \( \rightarrow \) Erizos \( \rightarrow \) Ser humano

Determine as matrizes \( A \), de segunda ordem, tais que \( A^{2}-2 I^{2}=0_{2 \times 2} \)

\( \sqrt {x+8=4} \)

\[ \text { Grupo I } \] 1. Determine as matrizes \( A \), de segunda ordem, tais que \( A^{2}-2 I^{2}=0_{2 \times 2} \)