How do I do such thing?

a= -5

Explanation:

Rewrite the equation to be: 3^a=3^-1 / 3^4

Multiply by adding exponents :))

which would then be 3^a = 3^-5

Then, since the bases are the same then the a would equal negative (-) 5. :))

Hope this helps :)) Plz mark brainlest :))

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