A student’s incorrect attempt to simplify an exponential expression is show in the box What is his mistake

A

Step-by-step explanation:

x^a/x^b=x^(a-b). General rule of exponents

if x = 1, then the answer is 3.5

total amount to be paid = $19.5

step-by-step explanation:

given ,

original price = $25.99

discount = 25%

discount amount = 25% of original price

discount amount = 25/100   * 25.99

discount amount = $6.49

hence , the total amount to be paid = original price - discount amount

                                                            = $25.99 - $6.49

                                                            =$19.5

total amount to be paid = $19.5