Top answers

Factorise x^2+3x-4

Answer is:(x-1)(x+4)
TA
Answered by Tahmina A. • Maths tutor
6055 Views

State the reagents and conditions for the formation of an aldehyde, starting from a primary-alcohol.

Answer: Heat with acidified potassium dichromate (IV), distilling off the aldehyde as it forms. Explanation: To form an aldehyde from an alcohol the alcohol group must be oxidised. To do this we use potassiu...
TO
Answered by Tom O. • Chemistry tutor
6484 Views

Which verbs use etre and which use avoir in the past tense, and why?

The past tense is constructed in 2 parts: 1) the auxiliary 'avoir' or 'être' is conjugated in the present + 2) the past participle of the verb. The majority of verbs use avoir in the past tense (e.g. j'ai ma...
FW
Answered by Flick W. • French tutor
4064 Views

Describe how water moves from roots to leaves (3 marks)

Via the process of transpiration:Water is evaporated from the leaves in the canopy. Due to capillary action, this causes more water to move up the plant through the xylem vessels to replace the water as it i...
LN
Answered by Laura N. • Biology tutor
5742 Views

y = e^(e^x). Show that the curve has no maxima or minima for any real number.

dy/dx = (e^x)*(e^(e^x)) which is never equal to zero so it does not have any maximum or minimum.
PM
Answered by Pablo M. • Maths tutor
1791 Views