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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 file.
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Answered by Ishaaq N. • Maths tutor
3690 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) ener...
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Answered by Samuel H. • Physics tutor
21345 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 creates ...
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Answered by Eoin B. • Biology tutor
3906 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 line...
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Answered by Samuel H. • Maths tutor
3294 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 may ...
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Answered by Krishna M. • Geography tutor
2545 Views