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If 3x+6x+3=21, find the value of x

To start, i would put all the x's on one side of the equation and the two numbers on the other side of the equation. However be careful when moving the 3 as when we move it over the equals symbol its sign in...
HC
Answered by Henry C. • Maths tutor
5923 Views

2.5 x 100

250
SR
Answered by Sara R. • Maths tutor
6931 Views

When do you use Mode, Mean and Median

You should use the mode if the data is qualitative (colour etc.) or if quantitative (numbers) with a clearly defined mode (or bi-modal). It is not much use if the distribution is fairly even. Median You shou...
VH
Answered by Varad H. • Maths tutor
15825 Views

Expanding and simplifying, e.g. (x+4)(x-2)

To break this down easily we can use a technique called a 'Farmers Field' ! Drawing a box with a cross through the middle to make 4 mini boxes, we can then use each mini box to write out each part of the ans...
JH
Answered by James H. • Maths tutor
4289 Views

Find the tangent for the line y=x^3+3x^2+4x+2 at x=2

Firstly, differentiate the equation y=x 3 +3x 2 +4x+2 to find the gradient function. The gradient function is dy/dx and is found to be 3x 2 +6x+4 = f'(x) after differentiation. The simple rule is to multiply...
WC
Answered by Wafi C. • Maths tutor
6095 Views