What is the factored form of the following expression?
x2 – x – 42
a. (x – 7)(x + 6)
b. (x + 7)(x + 6)
c. (x + 7)(x – 6)
d. (x – 7)(x – 6)

The base of a triangle exceeds the height by 7 centimeters. if the area is 400 square centimeters, find the length of the base and the height of the triangle.

Is the product of two rational numbers irrational or rational? first, make a hypothesis by multiplying two rational numbers. then, use variables such as x=a/b and y=c/d and the closure property of integers to prove your hypothesis.

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