Express using algebra. Z decreased by 15%

Answer 1

Hi Vai,

You can write this equation one of three ways:

*z-15%

*z-0.15

*z-3/20

(0.15 is 15% written as/converted to a decimal.

3/20 is 15% written as/converted to a fraction: 15/100 [all percentages are always written as the whole-number numerator over 100 as the denominator by default since 100 is the maximum percentage, period] = 3/20 as a simplified fraction.)

Answer 2

Z-15%

or

z-0.15

or

z-15/100 or 3/20 simplified