15A can mean an item that is listed as fifteenth grade a. Or it can mean an evaluation in math. Or it can also mean the term number in a contract, etc.
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"Long" is one of those slippery rubber words that are completely unscientific because they mean different things to different people, and can even mean different things to the same person at different times. If you're in a battleship or a jet aircraft, then 3 miles is not long at all. But if you're in a wheelchair, then 3 miles is quite long.
To factor the expression 15a - 25b + 20, we first look for common factors among the terms. The greatest common factor among the coefficients is 5. We can then factor out 5 to get 5(3a - 5b + 4). This is the factored form of the expression 15a - 25b + 20.
lcm(9a, 15a²) = 45a² Factorising: 9a = 3² × a 15a² = 3 × 5 × a² lcm = 3² × 5 × a² = 45a²
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