Answer:
He sells 8 CDs and 12 DVDs.
Step-by-step explanation:
In order to solve this, we have to set up a system of equations. We'll let x equal the amount of CDs and y equal the amount of DVDs. First, we'll set up an equation for the total number of items sold.
CDs + DVDs = 20 items
x + y = 20
Now we can set up one for amount of money made.
$9 for every CD + $11 for every DVD = $204
9x + 11y = 204.
Now that we have 2 equations we can solve. To do so, we'll multiply the first equation by -9 and then add them together.
-9x - 9y = -180
9x + 11y = 204
-------------------
2y = 24
y = 12
Now that we have the y value, we can find the x value by plugging into either equation.
x + y = 20
x + 12 = 20
x = 8
B. Multiply every value in D by 3 then add together
1 gram = 100 centigrams
5.2 grams = 520 centigrams.
5.2 grams (5.2 centigrams) weighs more than 500 centigrams.
Note that two negatives = one positive
- (-4 1/3) = + 4 1/3
Subtract
-9 + 4 1/3 = -4 2/3
-4 2/3 is your answer
hope this helps
Answer:
total area = 100
Step-by-step explanation:
10 x 4 = 40
1/2 * 6 * 10 = 30 ( x 2 triangle) = 60
total area = 40 + 60
total area = 100
