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What is a catalyst?

A substance which increases the rate of a reaction without being consumed

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What is the best way to learn declensions?

There are a few ways to learn declensions.Draw out the table and try to fill it in from memory.Note down sentences you come across which involve the declensions you struggle with and test yourself on them...

Answered by Jake T. • Latin tutor

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A train is travelling at 50m/s. How long does it take the train to reach 60m/s if it accelerates at a constant rate of 0.5m/s^2? How many kilometres does it travel in this time?

The initial velocity, u, is 50 ms^-1 The final velocity, v, is 60 ms^-1 The acceleration, a, is 0.5ms^-2 The question is asking us to find the time, t. The equation of motion...

Answered by Elena S. • Physics tutor

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f(x)=x^2+12x+32=0, solve for x

Method 1: Quadratic formulaf(x)= ax²+bx+c, therefore a=1, b=12, c=32 - quadratic formula= (-b+/-(b²-4ac)^1/2)/2ax=(-12+(144-128)^1/2/2 = -4 or x=(-12-(144-128)

Answered by • Maths tutor

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Explain how evolution by natural selection brings about changes in a species ?

Variation is present in a population, this can either be genetic variation or due to mutations. A selectional pressure causes a stuggle for existance. Selectional pressures can come from a predator, disea...

Answered by Martina S. • Biology tutor

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