(a) About 10 dollars. Around 7 intervals is going to be enough to see a difference.
(b) A good interval to use, is months. 12 points on the y axis is more then enough to make a graph that would represent this information.
Let a, b, c, d be coefficients for the balanced reaction:
a HC₂H₃O₂ + b KNO₂ → c KC₂H₃O₂ + d HNO₂
Count the elements among the reactants and products:
H: 4a = 3c + d
C: 2a = 2c
O: 2a + 2b = 2c + 2d
K: b = c
N: b = d
Suppose we let b = 1. Then both c = 1 and d = 1, and in the O equation we have
2a + 2 = 2 + 2 ⇒ 2a = 2 ⇒ a = 1
(Note that the equations for H and C also hold up.)
So the balanced reaction is simply
1 HC₂H₃O₂ + 1 KNO₂ → 1 KC₂H₃O₂ + 1 HNO₂
Let's find the amount of time in between.
3 hours are in between.
The amount of minutes in 3 hours are 180 minutes.
The car travels 162 miles in 180 minutes.
162 miles:180 minutes
x miles : 60 minutes
Let's divide 162 by 3
54 miles : 60 minutes.
It travels an average of 54 miles per hour.
So first you would use the PEMDAS method. You would begin by subtacting 12 and 5 which is 7 then you would 7 multiply by 12 which is 84. Lastly you would divide it by 6 which would leave you with your final answer 14
Answer:
A.
Step-by-step explanation:
