The correct answer is C. Formula
Step-by-step explanation:
Calculus is a branch of mathematics that focuses on arithmetic operations which often involve complex numerical relationships. Due to this, in calculus, it is common to find equations or formulas that are defined as mathematical expressions of equality, for example, X+12= 30 in which X+12 is equivalent to 30. Additionally, the purpose of calculus is to solve equations or formula and find out unknown values. Moreover, formulas in calculus are rules that help determine a specific value, for example, to determine the area of a triangle the formula is A = b x h /2 which means the area is equal to the base multiply by the height and divide by two. Thus, in calc, an equation is called a formula.