Differentiation is part of calculus
differentiation basically allows you to find the gradient of tangent
The second one is the only equivalent equation. Simply plug in each variable in each equation. And compare!
You have to multiply your 20cm by 6cm and your final answer being 120 because 0 times 6 is zero and 2 times 6 is 12, then that getting you 120
0.9 as a percentage would be 0.9% it doesn't really change
Discount =5%
Regular price =$83
Price at which daniel bought the shorts =$83-5%of$83
=$83-5×83/100
=$78.85
