If you cut an 8 foot pipe into 1/3 foot sections that would be B. 24 sections of 4" pipe
R x 9
multiplication problem, r times 9
could also be 9r
F(x) = 3x+1
put x = a+h
f(a+h) = 3(a+h) + 1
f(a+h) = 3a + 3h + 1
put x = a
f(a) = 3a + 1
f(a+h)-f(a) = 3a + 3h + 1 -(3a+1)
f(a+h)-f(a) = 3a +3h + 1 - 3a -1
f(a+h)-f(a) = 3h
About 0.5 percent per year