There are total 10 right angles in the given diagram, hence option (b) is correct match.
<em>Refer the attached image for clarification. </em>

Answer:
associative
Step-by-step explanation:
u switched parentheses
Answer:

Step-by-step explanation:
10 time the number for friend equals the cost
Y = X/2 is directly proportional
Y = 2/X is not directly proportional
Hope this helps! :)