Line graphs
Line graphs show how information is linked together,  if the line goes diagionally up to the right then there is a positive correlation and if it goes to diagonally up to the left there is a negative correlation.

A histogram is way of displaying data. It looks like a bar chart but it is completely different and much harder to plot.

Points to remember ~

-A/ A* grade work

-Area of the bar instead of the height it reaches

-Uneven class widths

FORMULA

Frequency Density = Frequency ÷ Class Width

Simultaneous equations liner and quadratic.

a = 5.2

b = 7.1

c = 42

Type into the calculator ' 1/2 x 5.2 x 7.1 x sin(42)

sin=^opposite / _hypotenuse

cos=^adjacent / _hypotenuse

tan=^opposite / _adjacent

SOH ~ Sin, Oppostie / Adjacent

CAH ~ Cos, Adjacent / Hypoteneuse

TOA ~ Tan, Opposite / Adjacent