What is a proportion that has means 6 and 18 and extremes 9 and 12

Sherina wrote and solved the equation. x-56=230 x-56-56=230-56 x=174 what was sherina’s error? sherina’s work is correct. sherina only needed to subtract 56 from 230. sherina made a subtraction error when subtracting 56 from 230. sherina should have added 56 to both sides of the equation.

Solve for x where 0 equation: cot^2x+2cotx+1=0

Aiko jumped rope for 20 min and stopped at 8: 05 when did she start