Top answers

What are the limits of an inverse tan graph.

pi/2 and -pi/2
EH
Answered by Emily H. • Maths tutor
3861 Views

How does the reactivity change down Group 1 elements, and why?

The reactivity increases. Group 1 are the alkali metals so they react by losing their valence electrons. Caesium is more reactive because it gives up its electrons more readily. It has more inner shells so i...
EH
Answered by Emily H. • Chemistry tutor
3621 Views

Expand the brackets to create an equation. (2x+7)(x-3)

shown using a diagram during interview using the crab claw method, multiplying the correct components with one another, displaying how to set it out neatly and correctly to the benefit of the examiner. = 2x^...
JF
Answered by James F. • Maths tutor
2445 Views

What causes or reduces resistance in a material?

Resistance can be thought of as the amount of distruption to the flow of electrons. If we look at the equation for resitivity:R=kl/A,where k is the resistivity of the material (and is dependant on the materi...
DG
Answered by Daniel G. • Physics tutor
2216 Views

16cos30° - 5tan60° = √x. Find the value of x.

Split up the two terms: cos30° = (1/2)√3 and tan60° = √3 (from memorised values of cos and tan)Therefore 16cos30° = 8√3 and 5tan60° = 5√3 8√3 - 5√3 = 3√3 = √9 x √3 = √27x=27
DG
Answered by David G. • Maths tutor
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