Top answers

Make n the subject of the formula: m = 5n - 21

The answer is: n = (m + 21)/5 How did we get this? Right now, the equation is written in the form where m is the subject. We want to rearrange this so that n is the subject of the formula. The formula should...
JC
Answered by Jabin C. • Maths tutor
20858 Views

A right angled triangle has 2 known sides measuring 3 meters, 4 meters respectively. Find the hypotenuse and the smallest angle in the triangle.

This is an example of a pythagoras. The student has to use the knowledge that the hypotenuse (longest side) is the square root of the sum of the squares of the known sides. In this instance, it would be 4^2 ...
ZM
Answered by Zara M. • Maths tutor
5529 Views

Find x and y when 3x + 4y = 27 and x + 2y = 11

Use the elimination method to remove a common coefficient. Multiply one of the equations to find a common coefficient, eg multiply the second equation by 2 to get 2x + 4y = 22, to reach the common coefficien...
ES
Answered by Eleanor S. • Maths tutor
6991 Views

The line AB has equation 3x +5y = 7 . Find the gradient of AB.

Firstly, you should change the equation into the form y=mx+c where m is the gradient and c is the y-intercept. This can be done by subtracting 3x from each side of the equation to give 5y=-3x+7. Then dividin...
CG
Answered by Conal G. • Maths tutor
8402 Views

Expand and simplify (x+6)(x+4)

Answer: x 2 +10x+24 Method: A handy way of knowing how to expand brackets involves the pneumonic FOIL: - F stands for First, so we multiply the first term in the first bracket by the first term in the second...
EM
Answered by Emma M. • Maths tutor
26474 Views