I believe the answer is estrogen. This is a female sex hormone, not related to stress.
1 m = 100 cm....so 2.5 m = (2.5 * 100) = 250 cm
a = 1st shelf
b = 2nd
c = 3rd
d = 4th
a + b + c + d = 250
b = 2a + 18
c = a - 12
d = a + 4
a + (2a + 18) + (a - 12) + (a + 4) = 250
5a + 10 = 250
5a = 250 - 10
5a = 240
a = 240/5
a = 48 cm <== 1st shelf
b = 2a + 18 = 2(48) + 18 = 114 cm <== 2nd shelf
c = a - 12 = 48 - 12 = 36 cm <== 3rd shelf
d = a + 4 = 48 + 4 = 52 cm <== 4th shelf
so 2nd shelf is 114 cm
The wings of the butterfly would be 67 millimeters
Step 1) Plot the points (you do know how to plot, do you?)
Step 2) Take that point and move it 8 squares to left then 9 down
Step 3) You should get (-3,-4). If you didn't let me know. :)
Step 4) ABout how many units are they away from each other?
Step 5) Hint: add the units you needed to move.
Hope this helps. Let me know if it didn't. :)
