Answer:

Step-by-step explanation:
First Rectangle:

Second Rectangle:


Y = cos(x)
sqrt(3)/2 = cos(30º)
dy = -sin(x)*dx
dy = -sin(30º)*(pi/180) = (1/2)*(pi/180)
y + dy = cos(x) - sin(x)dx
y + dy = sqrt(3)/2 - (1/2)*(pi/180) = 0.8573
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I don't see the grid? did you attach a photo?
2. 3. 5. are correct
1. and 4. are actually interchanged
No it isn't because 2/5=0.4