Question

marisol burned 670 calories while exercising on monday. if ling burned ( x ) fewer calories while exercising than marisol did, which of the following represents the number of calories ling burned while exercising?
choose 1 answer:
a ( x )
b ( 670 - x )
c ( \frac{670}{x} )
d ( x + 670 )

Explanation:

Step1: Define known value

Marisol's calories: $670$

Step2: Relate Ling's calories

Ling burned $x$ fewer, so subtract $x$ from Marisol's calories.
Expression: $670 - x$

Answer:

B. $670 - x$