Question

Need help with these 3 math questions on functions please.

Answer 1

Q4.

$f(x)=\sqrt{x}+4\\\\D:\ x\geq0$

Answer: all real numbers greater than or equal to 0.

Q.

The range is read from the y axis. Therefore the range = (-∞ , 1]

Answer: {y | y ≤ 0}

Q.

The first part of the graph has a slope = 2, therefore it's y = 2x.

The second part of the graph is horizontal line y= 4.

Therefore your answer is:

$f(x)=\left\{\begin{array}{ccc}2x&if&x < 0\\4&if&x\geq0\end{array}\right$