Domain:
Range:
Please help i need to answer this by tonight!!

Domain:  (-∞, ∞)

Range: f(x) ≤ 4 or (-∞, 4]

Step-by-step explanation:

Given the quadratic function,

where (-1, 4) is the vertex.  Since the parabola is downward-facing, and its vertex is at point (-1, 4) in which it is the highest point, then it means that the value of range must be greater than or equal to 4.  

Therefore, the range of the graph is:

f(x) ≤ 4 or

interval notation: (-∞, 4].

Set builder-notation: {y ∈ R | y ≤ 4}

The domain is all x values. Therefore, we can say that the domain is:

interval notation: (-∞, ∞).

Set builder-notation: {x | x ∈ R}.

d. $6.60

Step-by-step explanation:

3 cost 3.60, then 5.5 would cost ?

So we have to find what multiplied with 3 would equal 5.5, so:

5.5/3, we can't simplify this fraction so we'll just use it to multiply 3.60

3.60 × 5.5/3 = 19.8/3 = 6.6