Does somebody understand this ?

Drag each scenario to show whether the final result will be greater than the original value, less than the original value, or the same as the original value. 1. a 25% decrease followed by a 50% increase 2. a 20% decrease followed by a 25% increase

The price of an item has been reduced by 30%. the original price was $30. what is the price of the item now ?

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)