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Makovka662 [10]
2 years ago
7

Simplify the expression 5x + 4 + 9x =

Mathematics
2 answers:
Ann [662]2 years ago
5 0

Answer:14x+4

Step-by-step explanation:

slega [8]2 years ago
5 0

edit: the answer is 14x + 4

(the reason i edited was to cause less confusion)

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Josh invested $450 at 0.5% simple interest for 2 years. How much is his total account balance at the end of 2 years?
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2 years ago
When Cullen cleaned behind his dresser, he found 73 cents, all in nickels and pennies. There were 25 coins. How many were nickel
Georgia [21]
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.
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The value is $0.73.
Our answer is correct.
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3 years ago
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