area under y axis
that means the value of x is same as the value of y
X is divisible by Y if there is an integer Z such that X = Y*Z that is, Y will go into X without remainder.
y
2d means 2 dimensional or flat figures. If you are dealing with algebra or graphing, it would mean X and Y coordinates only, not Z.
(x+y)/2 gives you the average you just add the values together and divide by the number of values you have
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A expression in maths is a collection of terms without an equality sign.
"tenth"
What symbol
division
circle