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Based on the straight line equation of y = mx + c, where m is the gradient and c is the y-intercept, 3 would be the gradient and 7 would be the y-intercept.

Factorise the equation to find the critical values:
x^2 - 3x - 18 > 0 (x-6)(x+3) > 0
Critical values:x - 6 = 0x = 6
x + 3 = 0x = -3
Draw a graph where a parabola (shape of a quad...

First of all, we put all the unknowns to the same side. 67x and 12x will be on the left hand side; 13 and -5 are on the right hand side. For the unknowns, when 12x moves from right hand side to the left h...

let it be 0.75/1 (every number is a fraction over 1)this can then be written as 75/100, this can then be simplified to 15/20 when both top and bottom are divided by 5. This is not yet the smallest form as...

40 people in total16 = at least a phone, 7 = only a tablet, 13 = both
Must figure out how many people just own a phone: 16 - 13 (both phones and tablet) = 3 (just ow...