Answer:
Step-by-step explanation:
total marbles=11+4=15
plastic yellow marbles=4/2=2
P=(plastic marbles)/(total marbles)=2/15
Answer:

Step-by-step explanation:

Adding 10 to both sides.


Adding
to both sides.


Dividing both sides by 10.


∴ 
Answer:


Step-by-step explanation:
<h3>
a. </h3>

<h3>b.</h3>

A is the right option! Because 0.40 should be in second equation with the x to represent the number of stamps multiply by 40 cents.