Please give me correct answers Some gave me wrong answers an

Please give me correct answers; Some gave me wrong answers and never replied me back, thereby wasting my valuable question. I hope that doesn\'t happen twice. Thanks!

Solution

1) amplitude = |12- 5| = 7

midline = 12

period = 4

b = 2pi/4 = pi/2

Let function be : y = asin(bx +c) +d

y = -7sin(pi*x/2 +c) + 12

Point ( 0, 12) .Find c:

12 = 7sin(c) +12

7sin(c) =0 ----> c= 0

So, y = -7sin(pi*x/2) +12