Write an exponential decay function to model each situation. Compare the average rates of change over the given intervals. 21.) Initial Value: 50
Decay Factor: 0.9
1<x<4
5<x<8
22.) Initial Value: 25
Decay Factor: 0.8
2<x<4
6<x<8

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

answer: bea's uncle is 25 years old.

step-by-step explanation:

given the equation , we can say that the variable "x" represents the age of bea's uncle. then to find his age, we need to solve for "x":

we must add 15 to both sides of the equation:

now we need to divide both sides of the equation by 3:

therefore, we can conclude that bea's uncle is 25 years old.

4+4+2x

or

2x+8

step-by-step explanation: