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Work out the value of 2^4

2x2x2x2 = 4x2x2 =8x2=16or(2x2)x(2x2)=(4)x(4)=16
KY
Answered by Kieran Y. • Maths tutor
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Factorise x^2 -2x-3

Because of the signs within the equation we know that the factorised solution will be in the form (x+?)(x-?)The two numbers in the brackets have a product of -3 and the sum of -2.In this case, the numbers ar...
JA
Answered by Joshua A. • Maths tutor
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Describe the secondary effects of volcanic eruptions [4]

Volcanic eruptions can result in a wide variety of secondary effects, which are effects which happen some time after the eruption itself. Most commonly, these are negative, for example, travel can be disrupt...
CG
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What is the difference between the perfect tense and the preterite tense?

The preterite and perfect tenses are both used when an action has been completed . Then, what is the difference? Well, their use depends on regional differences and varieties of Spanish. But don't panick! It...
JB
Answered by Joanes B. • Spanish tutor
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Describe how elements of the periodic table are arranged relating to their atomic structure. (6 marks)

Elements in the periodic table are arranged by increasing atomic number (number of protons). Atomic number of elements steadily increases across a period (horizontal rows of the periodic table). Elements in ...
JG
Answered by Jake G. • Chemistry tutor
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