Game Maker Programming/Mathematical calculations

Game Maker can perform mathematical functions on integers, on variables containg integers. Writing in code:

2*2

would equal 4. If a=2, then:

a*a

would also equal 4. Game Maker can perform basic addition, multiplication, subtraction and division, as well as square rooting, as shown below:

sqrt(integer);

List of functions

random(x)	Random decimal number between 0 and x (including 0, but not x).
random_range(x,y)	Random decimal number between x and y (including x, but not y).
abs(x)	Absolute value of x.
sign(x)	Sign of x (-1, 0, or 1)
round(x)	Round to nearest integer. (.5 rounds to nearest even.)
floor, ceil(x)	Floor and ceiling functions.
frac(x)	Returns fractional portion.
sqrt(x)	Square root.
power(x,n)	xn
exp(x)	ex
ln(x)	Natural log of x (loge x)
log2(x)	Log 2 of x.
log10(x)	Log 10 of x.
logn(n,x)	Log of base n of x.
sin (x), cos(x), tan(x)	Sin, cos or tan of x.
arcsin, arccos, arctan(x)	Inverse sin, cos or tan of x.
arctan2(y, x)	arctan(y/x). returns angle in correct quadrant.
degtorad(x), radtodeg(x)	Converts between degrees and radians.
min(...), max(...), mean(...), median(...)	Returns min, max, mean or median of all arguments.
point_distance(x1, y1, x2, y2)	Returns distance between two points.
point_direction(x1, y1, x2, y2)	Returns direction from (x1, y1) to (x2,y2) in degrees.
lengthdir_x(len, dir), lengthdir_y(len, dir)	Returns x or y component of the indicated length and direction.