P(8 or 12) = 1/6
P(not 8 or 12 = 5/6
Let the expected points fro one roll be X.

The answer is -(1/6) points.
Red blood cell, as they have a biconcave shape and need to store a lot of haemoglobin, the pigment of blood
hope this helps! :)
ax+by=20
a represents how many first items you bought
x represents the cost of the first item
b represents how many second items you bought
y represents the cost of the second item
<h3>hello!</h3>
Plug in the values of the variables:-




<h3>note:-</h3>
Hope everything is clear; if you need any clarification/explanation, kindly let me know, and I'll comment and/or edit my answer :)