$7 is the correct answer for *per hour*, as 9-2=7. Notice how it says how much did you earn last year, implying total earned. How many hours did you work last year?
To find the answer,we can picture how much the above value is by objects in real life.
2mL = about two drops of water
200mL = about a carton of milk/ a box of ornage juice
2L = 2000 × 10 mL = 20000 mL = The bottle of drinks that are in family/party size.
As we only take in small dosages of medicine, the best option would be 2mL.
Hope it helps!
Answer ⇒ 
Step-by-step explanation:
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For perpendicular lines, m1m2 = -1 or m2 = -1/m1; where m1 and m2 are the slopes of the lines.
Here line 1 is 2x - y - 7 = 0
y = 2x - 7; Hence m1 = 2
m2 = -1/2
Required equation y - y1 = m2(x - x1)
y - (-1) = -1/2(x - 4)
y + 1 = -1/2x + 2
y = -1/2x + 2 - 1
y = -1/2x + 1
