Some would be appreciated

what is the equation of the midline of the sinusoidal function?

max = 5, min = -1

mid = (5-1)/2 = 2

{observe for sinx,

max = 1, min, = -1, mid=0}

since mid=2 we can let the function

y=a•sin(bx+c)+2

2a=max-min=6

a=3

y=3sin(bx+c)+2

the graph cross (0,2) so

2=3sin(c)+2

3sin(c)=0

c=0 or c=π

since the graph go down after (0,2), then we choose c=π.

max=5 with x=-1, so

5=3sin(-b+π)+2

sin(-b+π)=1

b=π/2

at last the get the exact equation, that's

its a straight line parallel to the time axis

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