Let n = number of nickels, and p = number of pennies.
The number of coins is 25, so we get this equation.
n + p = 25
The value of the coins is 0.05 per nickel, and 0.01 per penny.
0.05n + 0.01p = 0.73
Now you have a system of equations.
n + p = 25
0.05n + 0.01p = 0.73
Solve the first equation for n:
n = 25 - p
Now substitute into the second equation.
0.05(25 - p) + 0.01p = 0.73
1.25 - 0.05p + 0.01p = 0.73
-0.04p = -0.52
p = 13
There were 13 pennies.
Now we substitute 13 for p in n + p = 25 to find out the number of nickels.
n + 13 = 25
n = 12
There are 13 pennies and 12 nickels.
Check: 13 pennies and 12 nickels does total 25 coins.
13 * 0.01 + 12 * 0.05 = 0.13 + 0.60 = 0.73
The value is $0.73.
Our answer is correct.
Answer:
No, Yes, Yes
Step-by-step explanation:
<em>
</em>
2y = 3 - 5x
y = (3-5x) / 2
<em>F</em><em>A</em><em>L</em><em>S</em><em>E</em>
2P = w + 8
w = 2P - 8
<em>T</em><em>R</em><em>U</em><em>E</em>
<em>
</em>
by = c - ax
y = (c - ax) / b
<em>T</em><em>R</em><em>U</em><em>E</em>
Wheres the choices at? this isn't applicable.
Answer:
to write an expression, we often have to interpret a written phrase. For example, the phrase “ 6 added to some number” can be written as the expression x + 6, where the variable x represents the unknown number.
Step-by-step explanation:
