Search our library of homework questions

Top answers

All subjects

All levels

Expand 5yx^2 (3x^3 - 5xy + wy^2)

To do this we must multiply each of the individual terms inside the brackets by the outside terms. Be cautious of the negative term and its corresponding sign. We will go over the method in the uploaded f...

Answered by Ishaaq N. • Maths tutor

3222 Views

Explain the input and output energy sources for a car engine. How would you calculate the efficiency? Explain in terms of the inputs and outputs how the efficiency could be improved.

The input is chemical energy (in the form of fuel). The outputs areSound (not useful)Kinetic (useful)Heat (may be useful)The efficieny is given by useful output energy divided by total input (or output) e...

Answered by Samuel H. • Physics tutor

18889 Views

Explain the process and mechanisms underpinning gas exchange in animal bodies.

The process responsible for gas exchange in animals is diffusion.
Air, containing oxygen needed for cellular respiration, is inspired in fills the lungs. The high concentration of oxygen in the lung...

Answered by Eoin B. • Biology tutor

3241 Views

By plotting appropriate graphs, find x to the nearest integer if x^2+3=2-4x.

Plot the graphs y=x^2+3 and y=2-4x. The solution(s) are the point(s) of intersection. The graphs can be plotted by making a table of values; this is the best method for the quadratic curve. The straight l...

Answered by Samuel H. • Maths tutor

2923 Views

Explain the formation of a destructive and constructive plate boundary, and describe where they are around the world.

A Destructive plate boundary is when the oceanic and continental plates move together. The oceanic plate is forced under the lighter continental plate. Friction causes melting of the oceanic plate which m...

Answered by Krishna M. • Geography tutor

2005 Views