3 years ago

Erin wants to purchase 3 CDs for $10 each. How much moneydoes she need?

Mathematics

2 answers:

Aloiza [94]3 years ago

7 0

Answer: 30

Step-by-step explanation:

8090 [49]3 years ago

6 0

Answer:

Step-by-step explanation:

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frozen [14]

Answer:

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Step-by-step explanation:

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2 years ago

Part of the proceeds from a garage sale was $470 worth of $10 and $20 bills. If there were 14 more $10 bills than $20 bills, fin

Brums [2.3K]

There are 25 $10 bills and 11 $20 bills.

Step-by-step explanation:

Given,

Worth of proceeds from garage = $470

Let,

x be the number of $10 bills

y be the number of $20 bills.

According to given situation;

10x+20y=470 Eqn 1

x = y+14 Eqn 2

Putting value of x from Eqn 2 in Eqn 1

$10(y+14)+20y=470\\10y+140+20y=470\\30y=470-140\\30y=330$

Dividing both sides by 30

$\frac{30y}{30}=\frac{330}{30}\\y=11$

Putting y=11 in Eqn 2

$x=11+14\\x=25$

There are 25 $10 bills and 11 $20 bills.

Keywords: linear equation, substitution method

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2 years ago

4 * x² - (6+y) when x = -2 and y = -9

aalyn [17]

Answer:

4 * (-2)^2 - (6+(-9))

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2 years ago

which can be the first step in finding the equation of the line that passes through points (5,-4) and (-1,8) in slope intercept

Kruka [31]

Answer:

Step-by-step explanation:

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2 years ago

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MatroZZZ [7]

Answer: D

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2 years ago

Erin wants to purchase 3 CDs for $10 each. How much moneydoes she need?​

Erin wants to purchase 3 CDs for $10 each. How much moneydoes she need?