Translate to an algebraic expression. The product of 21% and some number. The translation is=

Type the percentage as a decimal. use d to represent some number.

0.21d

To translate the given expression, we need to multiply 21% (written as a decimal) by some unknown number, represented by the variable d.

1. Convert 21% to a decimal by dividing it by 100: 21% / 100 = 0.21.

2. Multiply 0.21 by the unknown number d: 0.21d.

Therefore, the algebraic expression for "The product of 21% and some number (d)" is 0.21d.