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We will prove that 2^(n+2)+2^(n+1)+2^n is divisible by 7 using formula to multiply powers with the same base:a^(b) * a^(c) = a^(b+c)Now looking at our expression we can write:2^(n+2) + 2^(n+1) + 2^n = 2^n...

the reactant particles have more energy, so they move quicker, so there are more frequent successful collisions

skin - acts as a physical barrier; mucus and ciliated cells on mucous membrane in trachea - catch pathogens and sweep them up out of lungs; stomach acid - kills bacteria

The preterite tense is used for one-off or completed actions in the past. For example: Visitó España el año pasado. / She visited Spain last year.
The imperfect tense is used for repeated or continu...

When Odysseus and his men arrive on Circe's island, in Book 10, Odysseus immediately sets out, alone, to hunt for food for him and his men without knowing what dangers could face him on the island. In doi...