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4x + 7y = 1 1. 3x + 10y = 15  2. 1. x 3 (4x x 3) + (7y x 3) = 1 x 3                       12x + 21y = 3  3. 2. x 4  (3x x 4) + (10y x 4) = 15 x 4                         12x + 40y = 60  4. 4. - 3.  (12x -...

The external intercostal muscles contract, pulling the ribs upwards and outwards. At the same time the muscles of the diaphragm contract, pulling the diaphragm down and causing it to flatten. Both of thes...

As the temperature has increased the particles have more kinetic energy which causes them to move more quickly so there are more collisions per unit time. Also, due to their increased kinetic energy, more...

A network has multiple advantages and disadvantages - the main advantages are that it enables a team to work from multiple places, it means that you can share hardware which is both cheaper and easier, it...

A business may grow and experience lower average costs. This is due to economies of scale, which indicates that rising output results in lower costs. There are many types of economies of scale and it is i...