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What is a good way to remember the sine, cosine and tangent rules of a triangle?

If you are trying to find the sine of an angle, remember: SOH The sine of an angle (S)= the length of the opposite side (O) / the length of the hypotenuse (H) If you are trying to find the cosine of an angle...
HW
Answered by Hannah W. • Maths tutor
4424 Views

Share £650 in the ratio 8:5

Begin by adding the 2 ratio parts (i.e. the numbers which make up the ratio) so 8+5 = 13. Then divide the total sum by the sum of the ratio parts. Thus £650/13 = £50. Multiply this by each of the ratio parts...
HV
Answered by Harry V. • Maths tutor
8029 Views

if x^2 + 9x + 20 = 0, what are the possible values of x?

So x 2 + 9x + 20 = 0 My preffered way of solving this equation is to factorise the equation. (Though I understand that different students may find other ways easier) Factorisation is where the above equation...
TP
Answered by Tilly P. • Maths tutor
11596 Views

How do I find the equation of a straight line?

Let's draw a line. It crosses the point (0,1), intercepting the y-axis (remember, y to the sky!) at 1 and the x-axis at the point (-2,0). An equation tells us what a line looks like, it's a way of describing...
DG
Answered by Dominique G. • Maths tutor
6872 Views

x = 0.045 (45 recurring). Prove algebraically that x can be written as 1/22

x=0.045 (45 recurring) 10x = 0.45 (45 recurring) 100x = 4.54 (54 recurring) 1000x = 45.45 (45 recurring) To get rid of the decimals: 1000x-10x = 45.45 - 0.45 990x = 45 x = 45/990 x = 9/198 (simplify by divid...
JT
Answered by John T. • Maths tutor
60587 Views