The unit rate of the equation is 3x+7
Answer:
The number of nickels is 29 and the number of dimes is 12
Step-by-step explanation:
Let
x -----> the number of nickels
y ----> the number of dimes
Remember that
1 nickel=$0.05
1 dime=$0.10
we know that
0.05x+0.10y=2.65 -----> equation A
x=3y-7 ------> equation B
Solve the system by graphing
The solution of the system is the intersection point both graphs
The solution is the point (29,12)
see the attached figure
therefore
The number of nickels is 29 and the number of dimes is 12
Before we calculate we can use some common sence thinknig to narrow down the choices. We know that Robert is gonig DOWN the hill, so it doesnt make sence that he woudl have a positive rate of change (i.e. the number feet up the hill he is is decreasing, not increasing) So right away, A & B are clearly wrong.
If we look at the last two (C & D) we can see that if -460 were right after 10 minutes he would have walked down 4,600 feet. This is WAY more that the total height of the hill and so can't be correct.
So C must be correct.
We can check this with some simple math:
Answer:
28.274333882308138
Step-by-step explanation:
I think it's correct..
I divided 30cm by 50% and then put 6 into a pizza area calculator and came up with this answer.e
The Solution.
The correct answer is option B.
Explanation:
This option is the only option with a constant change of 5 unit