Which points lie on the graph of the function f(x) = ⌈x⌉ + 2? check all that apply.

a. (–5.5, –4)
b. (–3.8, –2)
c. (–1.1, 1)
d. (–0.9, 2)
e. (2.2, 5)
f. (4.7, 6)

Celing function, means round up every x
for this particular function, round up every x and add 2

test them
round up then add 2 every x
A. rounded up is -5, add 2 gets -3, not -4. nah
B. rounded up is -3, add 2 to get -1, not -2. .nah
C. -1.1, rounded up, -1, add 2, get 1, yep
D. -0.9, round up,get  0, add 2, get 2, yep
E. 2.2 round up, get 3, add 2, get 5, yep
F. 4.7, round up, get 5, add 2, 7, not 6, ope

C and D and E