Sound

6.1. What is sound? Sound is the propagation of vibrations and energy in a straight line and in all directions. It travels from the source of sound to the receptors. Unlike light, sound needs a material…

Choose. A stratified society

Match the following definitions with the correct society or social group: Society of the Ancien Régime in which social position was established by birth. New social system adopted during the industrial…

Complete. The economy expansion

Complete the sentences about economic expansion with the missing words: In the late 19th century, the low price of produced in the Americas caused an agricultural in Europe. The crisis was particularly…

The driving factors behind imperialism

1.1. Europe's dominance In the last few decades of the 19th century, the Second Industrial Revolution transformed the economies of the leading European powers. Great Britain, France, Belgium and…

True/false. Decline of monarchy and dictatorship

Are the following sentences about the decline of monarchy and dictatorship true or false?: After the crisis of 1917, politicians from different parties joined together to combat the post-crisis…

El colegio

Expresiones algebraicas

En ocasiones has utilizado las letras para representar números y has trabajado con expresiones algebraicas. Una expresión algebraica es una expresión matemática en la que intervienen letras,…

Evaluación Inicial 2 - Ecuaciones

Resuelve la ecuación 3x + 5 = 1. x =

Problemas de ecuaciones de segundo grado. Actividad 5

El gerente de un teatro sabe que si cobra la entrada a 12 € asistirán 300 espectadores. También sabe que por cada 0,2 € de rebaja en el precio de la entrada, asisten al espectáculo 20 personas…

Evaluación 6 - Elementos básicos de geometría

Define proyección ortogonal de un punto sobre un plano.