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Maths
GCSE

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.) = 32 = 9
New area = original area x (a.s.f.) = 20 x 9 = 180 cm2

PB
Answered by Paulina B. • Maths tutor
3380 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: ei...

RS
Answered by Rebecca S. • Maths tutor
2837 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 ...

CH
Answered by Charlie H. • Maths tutor
2948 Views

How do I deal with quadratic inequalities?

First of all, if not already done, you would arrange all the x's or whichever letter used on one side of the inequality. E.g. for x2+ 19x - 5 < 6x - 45 you would arrange it like: x2

AC
Answered by Asha C. • Maths tutor
2665 Views

Solve the following simultaneous equations: 2x-3y=16 x+2y=-6

First, label the two equations as follows:2x-3y=16 --> [1]x+2y=-6 --> [2]To obtain the same x value for both equations, [2]2: 2x+4y=-12 --> [3]Then, to eliminate the x values from both equati...

MH
Answered by Masaki H. • Maths tutor
3049 Views

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