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Solve the inequality. x^2 + 2x -15 > 0

To solve the inequality, it must first be factorised. This could be done by the ‘complete the square’ method. However in this example it is more efficient to find a pair of numbers that multiply to give the ...
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Answered by Elizabeth F. • Maths tutor
13822 Views

What is a food chain we might see in the UK?

A food chain demonstrates what different species of animals present in an ecosystem eat, and are eaten by. The start of the food chain is a producer - an organism which makes food. This is generally a plant,...
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Answered by Caroline T. • Biology tutor
13362 Views

Describe the formation of a waterfall

As a river moves through its upper course, it creates multiple erosional features such as waterfalls. The river moves over varying rock types, some harder and more resistant to erosion than others. The softe...
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Answered by Jamie S. • Geography tutor
4262 Views

What is the difference between the present perfect and the imperfect?

Present Perfect Finished past action: Il a cuisiné. An action which lasted a certain amount of time: Elle a étudié au lycée pendant trois ans. An action which has been repeated several times: Il a sonné quat...
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Answered by Esther M. • French tutor
2104 Views

What are the two auxiliary verbs in Italian grammar?

They are "essere" (to be) and "avere" (to have).
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Answered by Francesco M. • Italian tutor
2168 Views