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Find the area of a trapezoid with a height of 23, base 1 of 10 and base 2 of 18

Simplify (a/b - b/a) times (a - a^2/a+b) a - a^2/a=b is a mixed number

Let the closed interval [a , b] be the domain of function f. the domain of f(x - 3) is given by (a) the open interval (a , b) (b) the closed interval [a , b] (c) the closed interval [a - 3 , b - 3] (d) the closed interval [a + 3 , b + 3]