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List two reasons drugs to treat illness are often trialled

Accept any two from: Toxicity Dosage Efficacy side effects
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Answered by Charlotte B. • Biology tutor
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Please factorise and solve x^2 -1 = 0

using the method, what two numbers multiply to create -1 and add to make 0 -1 must be 1 x -1 therefore answer is (x+1)(x-1) - is it clear how the single x value is cancelled out? x^2 +x -1 -x = x^2 -1
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Answered by Laxmi A. • Maths tutor
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How do I conjugate the past tense?

Regular verbs in Spanish follow a series of rules which are easy to follow and remember. Forming the past tense follows these rules - easy peasy! You take the stem of the verb and add on certain endings, jus...
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Answered by Anna B. • Spanish tutor
2914 Views

Why do hurricanes form in some places but not others?

Hurricanes will only form where the sea surface temperature is 27 degrees C or above. This area of the ocean is located between the Tropics of Cancer and Capricorn, otherwise known as the ITCZ. The sea surfa...
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Answered by Alice H. • Geography tutor
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Solve the simaltaneous equations: 3x + 4y = 10, 2x + 3y = 7

Solving by elimination 1. multiply the equations by a number so that the number in front of either x or y is the same for both equations: 3x + 4y = 10 (X2) --> 6x + 8y = 20 2x + 3y = 7 (X3) --> 6x + 9y...
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Answered by Sarah T. • Maths tutor
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