Compared to a short-term investment, what is the general return of a long-term investment?
A. A long-term investment has a similar return to a short-term investment.
B. A long-term investment has a greater return because it has greater risk.
C. A long-term investment has a greater return because it has lower risk.
D. A long-term investment has a lower return because it has lower risk.
Answer (3)
3x-(2x+7) = -9 <=> x -7 = -9 <=> x = -2; y = 2(-2) + 7 = 3.
In chemistry, substitution refers to a reaction where one or more atoms or groups of atoms replace another atom or group of atoms in a molecule. This can happen in various types of reactions, such as the substitution of a halogen atom for a hydrogen atom in alkyl halides. An example of a substitution reaction is the reaction between ethane and molecular chlorine, where a hydrogen atom in ethane is replaced by a chlorine atom:
CH3CH3 + Cl2 → CH3CH2Cl + HCl
Substitution in mathematics involves replacing a variable in an equation with another expression derived from a different equation. This method helps solve systems of equations efficiently. The process includes identifying equations, substituting, simplifying, and back-substituting to find variable values.
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