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What is the point of bearings?

Imagine you want to sail a ship from Liverpool to new York. While sailing you will need to know precisely what direction you need to be travelling at every point(if you are out by one degree this could resul...
JS
Answered by Jamie S. • Maths tutor
3851 Views

n is an integer such that 6-3n>18 and (-5n)/(n^2-6)>1. Find all the possible values of n.

First we solve 6-3n>18. We do this by rearranging:Carry over the -3n term for 6>18+3n.Take away 18 from both sides for -12>3n.Divide both sides by 3 for -4>n.So we know that n<-4. Now we solve...
DC
Answered by Daniel C. • Maths tutor
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A rectangle has an area of 20 cm2. Its lengths are enlarged by a factor of 3. What is the area of the new rectangle?

Length scale factor (l.s.f) = 3 Area scale factor (a.s.f.) = 3 2 = 9 New area = original area x (a.s.f.) = 20 x 9 = 180 cm 2
PB
Answered by Paulina B. • Maths tutor
4012 Views

Solve the following simultaneous equations: 3x + y = 11, 2x + y = 8

first: look at the 2 equations and see if there are any matching coefficients. eg the same number before x or y in both of the equations. in these examples both y values have the coefficient 1. second: eithe...
RS
Answered by Rebecca S. • Maths tutor
3266 Views

How do I know whether to use sin, cos, or tan in trigonometry?

Label the sides of your triangleHypotenuse is the longest (opposite right angle)Opposite is opposite the given angleAdjacent is next to the given angleTwo are useful, one is irrelevant. Cross out the one tha...
CH
Answered by Charlie H. • Maths tutor
3550 Views