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Compare the following logarithms in base 1/2 without a calculator: log(8) and log(512)

Compare through subtraction : log 0.5 (8)- log 0.5 (512) = xUsing logarithm rule in addition/subtraction: log a (b)+log a (c) = log a (b*c) ; log a (b)-log a (c) = log a (b/c) where a,b and c are constants (...
GA
Answered by Gael A. • Maths tutor
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y=7-2x^5. What's dy/dx?Find an equation for the tangent to the curve where x=1. Is itan increasing or decreasing function when x=-2?

dy/dx=-10x^4When x-1, gradient =-10 Tangent is then: y+10x=15When x=-2, dy/dx=-160 so a decreasing function
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Answered by Khai L. • Maths tutor
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How does one distinguish between the perfect tense (passé composé) and the imperfect tense (imparfait)?

The perfect tense (passé composé) is used to depict a single past action that has been completed. Specific time phrases such as 'last weekend' (le weekend dernier), 'last week' (la semaine dernière) and 'las...
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Answered by Emily I. • French tutor
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Que era el papel de la mujer durante los años cincuenta? (utiliza el preterito imperfecto)

Suggested answer of something a pupil would be expected to say :Durante esa epoca las mujeres no TENÍAN mucho poder en la sociedad. CUIDABA a sus hijos mientras que los hombres TRABAJABAN. No HABÍA muchos de...
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Answered by Honor W. • Spanish tutor
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Factorise the following: 21x(squared)-35x

The question is asking us to factorise, this means put the equation into a simplified bracket. The first step is to find the highest common factor (HCF), the HCF must be a factor of 21x 2 as well as -35x. I ...
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Answered by Annesa M. • Maths tutor
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