Top answers

Factorise 2x^2 - 7x -4

2 x -4 = -8 -8 x 1 = -8 (2x^2-8x)+(x-4) 2x(x-4) + 1(x-4) (2x+1)(x-4)
NM
Answered by Nicola M. • Maths tutor
3850 Views

A right-angle triangle has a hypotenuse of 8cm and an angle of 30 degrees. What is the opposite's length?

sinx = o/h sinx x h =o sin30 x 8 = 4cm The opposite is 4cm
NM
Answered by Nicola M. • Maths tutor
4023 Views

In what circumstances can an ionic compound conduct electricity? How?

An ionic compound in its molten or liquid form is able to conduct electricity due to the free movement of conducting metal ions that can carry charge
JK
Answered by Jalini K. • Chemistry tutor
2845 Views

Explain how vaccines work.

Vaccinations are an injection of small amount of a dead or weakened form of a pathogen that provoke a primary immune response. This causes the body to produce the correct antibodies to remove the pathogen. T...
EM
Answered by Eleanor M. • Biology tutor
4025 Views

Explain antibiotic resistance in bacteria and its evolution.

Antibiotics are used as medicine to treat bacterial diseases. Bacterial diseases are the result of populations of bacteria, and bacteria within these populations are not all equally susceptible to antibiotic...
Answered by • Biology tutor
3038 Views