3x + 1 = 7 -4y solve the literal equation for Y

The graph represents f(x)=[x]+3. what is f(-2.2)?

Which graph represents the function f(x)=4[x]?

The lengths of two sides of a triangle are 9 and 15. what can be said about the length of the third side? a. it must be greater than or equal to 6 and less than 24. b. it must be greater than or equal to 6 and at most 24. c. it must be greater than 6 and less than 24. d. it must be greater than 6 and at most 24.