A constant is a number which is fixed in an question. On the other hand, a variable is a number which can change.
In your expression, 6 + axb, you have 1 constant (6), and 3 variables (a,x, and b).
Hope this helps :)
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f(x)= axb or y= axb
axb + cxd
V=h/3 (axa + axb + bxb)
it denotes the set of ordered pairs with elements of A and b in the format (a,b)
cfm=.32X(aXb)Xface velocity/144 a= width b=length