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B:G --> 9:7
Expressed as fractions of the whole group, boys are 9/16 of the group and girls are 7/16 of the group.
We can use algebra to work out the total group number. For our working, ...
The ratio given tells us that our paint mixture of 18 litres consists of 3 + 2 = 5 parts.
Each part therefore consists of 18/5 = 3.6 litre...
gradient =7 y intercept = 7
The root of an equation is a point where, when the equation is plotted on a graph, it crosses the x axis. The x axis is the line y = 0, so the roots can be found by setting 0 = ax2 + bx + c whe...
Using the quadratic formula (-b +- sqrt(b^2 -4ac))/2a we can sub substitute a = 1, b=2 and c = -4 to solve. The answer is x = -1 +/- sqrt(5)
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