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How would you find the mean for the numbers 100, 230, 450, 120 and 250?

The first step would be to add all of the numbers together. In this example the sum of the numbers would be 1150. The second step would be to count how many numbers there are, so 100 would count as 1 number ...
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Answered by Jemilla C. • Maths tutor
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15/7 + 5/4

Find the lowest common denominator between the two fractions, which is 28 (7 4 = 28).Multiply the fractions numerator (15 and 5) by the same number that you have used to multiply the denominator when finding...
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Answered by Allan D. • Maths tutor
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Given that f(x) = 1/x - sqrt(x) + 3. Find f'(1).

We are given that f(x) = 1/x - sqrt(x) + 3. Here, f(x) represents a function. A function is a relation or expression involving one or more variables. We are able to differentiate f(x) in order to find the gr...
Answered by • Maths tutor
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The point P has coordinates (3, 4) The point Q has coordinates (a, b) A line perpendicular to PQ is given by the equation 3x + 2y = 7 Find an expression for b in terms of a.

y = (7-3x)/2m = -3 / 2 therefore:Y = 2 / 3 X + cwhen Y = 4 and X = 3, c = 2therefore b = 2 / 3 a + 2
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Answered by Dilan P. • Maths tutor
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A pen is the shape of an equilateral triangle. A goat is attached to a corner of the pen on a rope. The goat eats all the grass it can reach. It can just reach the opposite fence of the pen. What percentage of the grass in the pen does the goat eat?

Step 1: Area of the penA triangle’s area is base * height / 2. Let one side (the base) have length x. By splitting the triangle in half and using Pythagoras’s rule, we get x 2 = (x/2) 2 + h 2 . This rearrang...
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Answered by Max C. • Maths tutor
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