Can someone tell me the equation for the word problem that’s starts with four minus 7

Restrictions on f(x) = 1/x+5 and g(x) = x-2

The number of fish in a lake can be modeled by the exponential regression equation y=14.08 x 2.08^x where x represents the year

[15 points]find the least common multiple of the expressions: 1. 3x^2, 6x - 18 2. 5x, 5x(x +2) 3. x^2 - 9, x + 3 4. x^2 - 3x - 10, x + 2 explain if possible