Plot -2.8 on the numberline. What number does the arrow point to on the number line?

Here are the solutions to the questions:

1. Plot -2.8 on the numberline.

Working out:
To plot $-2.8$, locate $-2$ on the number line. Then, move 0.8 units to the left. Since each small tick mark represents 0.2 units, moving 0.8 units to the left means moving $0.8 / 0.2 = 4$ tick marks to the left from $-2$.

Answer:
A point should be placed on the number line at the fourth tick mark to the left of $-2$.

$$\text{Number line with point at -2.8:}$$ $$\leftarrow\text{---}\underset{-4}{\text{---}}\text{---}\underset{-3}{\text{---}}\text{---}\underset{-2}{\text{---}}\text{---}\underset{-1}{\text{---}}\text{---}\underset{0}{\text{---}}\text{---}\underset{1}{\text{---}}\text{---}\underset{2}{\text{---}}\text{---}\underset{3}{\text{---}}\rightarrow$$ $$\text{The point for -2.8 is between -3 and -2, four small ticks to the left of -2.}$$ $$\text{It is also one small tick to the right of -3.}$$ $$\boxed{\text{See diagram below for plotted point}}$$

(Since I cannot draw on the image, I will describe the location for plotting.)
The point for $-2.8$ is located between $-3$ and $-2$. It is 0.2 units to the right of $-3$ (or 0.8 units to the left of $-2$).

2. What number does the arrow point to on the number line?

Working out:
The arrow is located between $-2$ and $-1$.
There are 5 small intervals between $-2$ and $-1$. This means each small interval represents $\frac{1}{5} = 0.2$ units.
The arrow points to the second small tick mark to the right of $-2$.
So, the value is $-2 + (2 \times 0.2) = -2 + 0.4 = -1.6$.

Answer:

$$\boxed{-1.6}$$

3. Write the next three multiples of 17.
17, 34, 51, 68, 85, \text{___}, \text{___}, \text{___}

Working out:
To find the next multiples, we add 17 to the previous multiple.
The last given multiple is 85.
Next multiple 1: $85 + 17 = 102$
Next multiple 2: $102 + 17 = 119$
Next multiple 3: $119 + 17 = 136$

Answer:

$$\boxed{102, 119, 136}$$