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The sum of the first K natural numbers is 300. Find the value of K.

S= 0.5n(n+1) ( formula for the sum of the first n natural numbers) 0.5K(K+1)= 300 ( sub in K and make the formula equal to the total sum given) 0.5K(K+1)-300= 0 ( take away 300 from both sides) 0.5K 2 + 0.5K...
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Answered by Meghan B. • Maths tutor
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Describe the role of the thylakoid membrane.

The thylakoid membrane is found within the chloroplast. The photosystems (I and II) are embedded within the membrane itself. It is the site of photophosphorylation and the electron transport chain (ETC), whi...
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Answered by Maria F. • Biology tutor
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What's the difference between PED, PES, YED, and XED?

PED stands for Price Elasticity of Demand. It refers to the percentage change of quantity demanded (Qd) of a product as a result of a change in price (P) of that product. It is calculated by dividing the per...
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Answered by Joshua D. • Economics tutor
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How unified was Italy in the period 1871-1914?

By 1871 Italy had come into being as a legally unified country. Disparate states and kingdoms were brought together under one unified legislative and executive body. This question examines the extent to whic...
Answered by • History tutor
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An object is let in free fall from a platform 20m high above Earth's surface. Describe the event in terms of energy and thus determine the speed of the object when it hits ground. Air resistance is negligible and gravitational acceleration is constant.

When the object is at rest on the platform it has no kinetic energy, but only potential energy. The potential energy is m g h where m is the mass of the object, g the gravitational acceleration and h the hei...
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