What is a tax bracket? a. the rate at which income is taxed b. the rate of sales tax in a state c. the form used to file taxes d. the way the government calculates tax returns

A. The rate at which income is taxed

Explanation:

The tax bracket refers to the rate at which income is taxed. The tax bracket leads to a progressive tax system. The United States uses a tax bracket because they have a progressive income tax system.

This progressive system means that the higher you earn, the higher your tax rate and the lower you earn, the lower your tax rate.

a=d/t

a="triangle"v/t

explanation:

a = acceleration