Top answers

Describe the flow of blood in the heart

Blood from the body enters the right atrium of the heart via the vena cava. It then travels into the right ventricle by a combination of gravity and contraction of the right atrium. After the right atrium ha...
ER
Answered by Emily R. • Biology tutor
2954 Views

Factorise x^2 - 14x + 49

(x - 7)^2
SK
Answered by Shikhar K. • Maths tutor
3633 Views

Define what is meant by GDP, and explain the limitations of using it as a proxy for economic growth.

GPD, or Gross Domestic Product, can be defined as the total value of goods and services produced in an economy over a given period of time; specifically, GDP includes all private and public consumption, gove...
Answered by • Economics tutor
2721 Views

A curve has the equation y = 4x^2 + 5x + 3 and a line has the equation y = x + 2. Show that the line and the curve have one point of intersection.

Set the equations equal to each other: 4x^2 + 5x + 3 = x + 2Collect terms and set equal to 0: 4x^2 + 4x + 1 = 0Factorise the equation: (2x + 1)(2x + 1) = 0Can now find the value of x: 2x + 1 = 0, therefore 2...
FG
Answered by Francesca G. • Maths tutor
7289 Views

A curve has the equation y=x^2+4x+4 and a line has the equation y=2x+3. Show the line and curve have only one point of intersection and find its coordinate..

First set the equations equal to each other: x^2+4x+4 = 2x+3.Rearrange for x in form ax^2+bx+c : x^2+2x+1=0Factorise: (x+1)^2=0. Repeated root, hence only one intersection. x=-1. Using y=2x+3, y=1. So coordi...
EF
Answered by Ewan F. • Maths tutor
4987 Views