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y=x^2 +4x-12, Find the Range (co-domain) when the domain of x is (1) -6 to 2 inclusive (2) the set of real numbers, R.

This question usually comes up at AS level where students have prior knowledge of quadratic functions:We need to 1) understand the 'shape' 2) locate the roots 3) Find the turning point 4) sketch the graph 5)...
PT
Answered by Pascal T. • Maths tutor
3290 Views

Why does gravitational potential energy have a negative value?

A point in a gravitational field has an associated gravitational potential. It is defined as the work done required to bring a unit mass from a point an infinite distance to that point in the field. At an in...
JP
Answered by Joseph P. • Physics tutor
4187 Views

The distinction between the imperfect tense and the passé composé

The imperfect tense and the passé composé are both past tenses which are used in different situations. The imperfect tense is used in three main cases: Habitual actions-> What used to happen regularly in ...
AS
Answered by Assunta S. • French tutor
1962 Views

Describe how B-lymphocytes respond when they are stimulated by antigens.

When B-lymphocytes are stimulated by antigens, they first divide by mitosis to form clones, some of which become plasma cells that secrete antibodies, others become memory B-cells which can be stimulated at ...
Answered by • Biology tutor
21222 Views

“Memories, even your most precious ones, fade surprisingly quickly." - How does Ishiguro present narration in Never Let Me Go?

Engage with the quote - dealing with memory, and the unreliability of it2) Link that to the unreliability of narration in Never Let Me Go, and how far we can trust Kathy H.3) Reasons for unreliability, and w...
Answered by • English tutor
2617 Views