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What is the mean of the numbers: 1, 7, 25, 9 and 34?

The mean of a group of numbers is found by dividing their sum by how many numbers there are. Mean=(1+7+25+9+34)/5=76/5=15.2
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Answered by Isabel R. • Maths tutor
4528 Views

How do I find the roots and and coordinates of the vertex of the graph y = 2x^2 + 4x - 8 ?

y = 2x^2 + 4x - 8y = 2( x^2 + 2x - 4)Completing the square:y = 2( (x+1)^2 - 1 - 4 )y = 2(x+1)^2 -10the vertex of graph lies at the minimum value of y, and this occurs when x = -1:y = 2(-1+1)^2 -10y = -10ther...
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Answered by Joe A. • Maths tutor
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s^2 - 2s - 24 = 0

s 2 ​ - 18s = 0(s + 4)(s - 6) = 0s = -4 s = 6
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Answered by Natasha P. • Maths tutor
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Prove that (2n+3)^2-(2n-3)^2 is a multiple of 8 for positive integer values of n

To prove that (2n+3) 2 -(2n-3) 2 is a multiple of 8 we are going to deal with the first bracket and then the second bracket. When a bracket has 2 next to it, this means that you multiplying the bracket, by t...
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Answered by Sioned D. • Maths tutor
25033 Views

Solve the simultaneous equations: 2x-3y = 24 and 6x+2y = -5

There are numerous alternative ways to solve these simultaneous equations. For this problem, one of the simplest methods is to multiply the first equation by 3, so that we get 6x in both equations: (2x - 3y)...
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Answered by Augustinas S. • Maths tutor
4650 Views