Answer :
cost of 1 calculator = d
how much do 13 calculators cost?
cost of calculators = (cost of 1 calculator) x (amount of calculators)
cost of calculators = d x 13
if we represent the "cost of calculators" as C, then
C = 13d
how much do 13 calculators cost?
cost of calculators = (cost of 1 calculator) x (amount of calculators)
cost of calculators = d x 13
if we represent the "cost of calculators" as C, then
C = 13d