Simplify into one fraction -2/x+3 - 4/x-5

You put $2000 in an account with a simple interest rate of 1.5%. how long does it take for the account to earn $60?

This is a rational expression because the denominator contains a variable. this is a polynomial with 3 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 4 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 4 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 3 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 5 terms.

Which strategy is used by public health to reduce the incidence of food poisoning?