For f(x)=-x+8, which statement is true?
a. f(x+k)=f(x)+k
b. f(x-k)=f(x)-k
c. f(x+k)=f(x)+f(k)
d. f(x-k)=f(x)+k

How do you answer this question? (step by step)

What is the volume of a rectangular prism if the length is 10.4 mm the width is 5 mm in the height is 8 mm

The perimeter of a rectangle is greater than or equal to 74 meters. if the length is 25 meters, the minimum width of the rectangle is meters.