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Waterfalls are an erosional landform which are formed when a band of soft rock is overlaid with a band of hard rock. Over time, the soft rock is eroded through a combination of hydraulic action* and abras...

The initial value of the car is 18000. To subtract 25% of 18000 one must times 18000 by 0.75 which equals 13500. Next, one must times 13500 by 0.88 to the power of 4 which equals 8095.89 to 2 decimal plac...

To solve this problem we're going to use an equation. First let's write down the information that we do know.Let's use (r) for ruler and (c) for crayon.
So 7 rulers and 15 crayons cost £7 (or 700 pen...

First write out the general equation, y = mx + c where m = gradient and c = the Y-interceptFind the gradient m= change in y/change in xM= (-4,-6)/(9-4) = (-10)/(5) = -2Find c by substituting in either of ...

To expand is just to multiply out. We will multiply everything inside the bracket by everything inside so it becomes
2a x 4 + 2a x a
Then we use bidmas to get:
8a + 2a^2