Answer:
volume=12m
Step-by-step explanation:
width*length*height=volume
4m=width
3m=height
4m*3m=12m
12m=volume
You add each number that is in the same position correlated to the box. Ex: 12+-3=9
This is how you solve this problem:
.10d + .05n = 5.25
(plug in the number of dimes we have)
(21 x .1) + .05n = 5.25
(multiply number of dimes x value of the dime)
2.10 + .05n = 5.25
(subtract 2.10 from both sides)
.05n = 3.15
(divide both sides by .05 to get the number of nickels)
n = 63 nickels
Hope this helps!