-- "off the top of my head"
-- "the whole nine yards"
-- "mind your P's and Q's"
-- "put a finer point on it"
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It is - a figure of speech not to be taken literally
6 feet under is an expression meaning someone has died. It is taken from the fact that the standard depth of a grave is 6 feet.
An entire number cannot have a place value. It is the property of each of its digits, taken one at a time.
A linear expression can only have a numeric factor that can be "taken out". The expression will be of the form ax + b where a and b are numbers that have k as their highest common factor (HCF). That is, a = k*c and b = k*d Than being the case, ax + b = kcx + kd = k*(cx + d)
The Pascal's triangle is used partly to determine the coefficients of a binomial expression. It is also used to find the number of combinations taken n at a time of m things .