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When do I use the sin rule and when do I use the cosine rule?

The sin rule is used when you need to find a length of a side or an angle. You use the sin rule when you're given an angle, an opposite side length and also an angle or side length opposite to the one you...

Answered by Natalie H. • Maths tutor

9745 Views

Solve x^2 - 9 = 4x + 12

x² - 9 = 4x + 12 x² - 9 - 4x = 12 x² - 9 - 4x -12 = 0 x²- 4x -21 = 0 Factorise into form (x + ?)(x + ?) Factors of -21 ar...

Answered by Kira P. • Maths tutor

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A group of 55 pupils were asked if they owned a phone or a tablet.11 people are known to own both18 said they only owned a tablet34 said they owned at least a phoneA student is picked a random, what is the probability that the student doesn’t have a phone

18/55

Answered by Umer H. • Maths tutor

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When will I ever need to use this in real life?

Maths is something you can make use of for the rest of your life.Obviously, there are a vast number of jobs out there, such as engineering, which use mathematics everyday so if that's the sort of thing th...

Answered by Alex M. • Maths tutor

3605 Views

How do I solve the simultaneous equations 5x+2y=11 and 4x-3y=18?

Simultaneous equations have two or more unknown values, in this case there are two: x and y. To solve them, first we need to get one unknown by itself. In order to do this we need the coefficient of eithe...

Answered by Helen T. • Maths tutor

7676 Views