You question implies simple subtraction is needed:
28-8=20
Answer:

Step-by-step explanation:
Let use the basic function of sin first.
Since the midline is 1 and the max point is 5, the amplitude is 4.
The midline is 1 since the midline is at 0,1.
Since we know the distance of the max and midline x values
We can multiply that by 4 to find our period.

Use the equation 2pi/b to find the b we would use in our equation.

The answer is

so our equation is

Good luck, i’m not sure what this is but like my comment and i’ll come back to it when i get my notes
Answer:
7/5
Step-by-step explanation:
rewrite as an equation ..
3 4/5 \ x = 2 5/7
times x to both sides
2 5/7x= 3 4/5
divide 2 5/7 from both sides
x=7/5