Aflowchart proof presents a logical argument using

 A flowchart proof presents a logical argument using boxes and arrows.

Step-by-step explanation:

We know that a flowchart proof is a way of representation of a mathematical proof that includes a logical series of statements ( or can say arguments) in boxes with connecting arrows.

i.e. we use boxes and arrows in a flow chart proof.

By the definition of flowchart proof, the complete sentence will be : A flowchart proof presents a logical argument using boxes and arrows.

this is the formula: v = the value of investment at the end of the time period

p = the principal amount (the initial amount invested)

r = the annual interest rate

n = the annual frequency of compounding (how many times a year interest is added)

t = the number of years the money is invested

^ means raise to the power of