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DochEvi [55]
3 years ago
14

What is BC ? Enter your answer in the box.

Mathematics
1 answer:
stiks02 [169]3 years ago
5 0
Mathematically it would be 8 since BE=CE and CE=4. 
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Philip made a total of 9 bracelets and necklaces from 120 inches of cord. He used 8 inches of cord for each bracelet and 20 inch
Viktor [21]

Answer:

So Philip made 5 bracelets and 4 necklaces.

Step-by-step explanation:

Let x = number of bracelets and y = number of necklaces.

Since we have a total of 9 bracelets and necklaces,

x + y = 9 (1)

Also, we have 8 inches of cord for each bracelet and 20 inches of cord for each necklace, then the total length for the bracelet is 8x and that for the necklace is 20y.

So, the total length for both is 8x + 20y. Since the total length of cord used is 120 inches,

8x + 20y = 120 (2)

Simplifying it we have

2x + 5y = 30  (3).

Writing equations (1) and (3) in matrix form, we have

\left[\begin{array}{ccc}1&1\\2&5\end{array}\right] \left[\begin{array}{ccc}x\\y\end{array}\right] = \left[\begin{array}{ccc}9\\30\end{array}\right]

Using Cramer's rule to solve for x and y,

x = det \left[\begin{array}{ccc}9&1\\30&5\end{array}\right] /det \left[\begin{array}{ccc}1&1\\2&5\end{array}\right] \\

x = (9 × 5 - 30 × 1) ÷ (1 × 5 - 1 × 2)

x = (45 - 30) ÷ (5 - 2)

x = 15 ÷ 3

x = 5

y = det \left[\begin{array}{ccc}1&9\\2&30\end{array}\right] /det \left[\begin{array}{ccc}1&1\\2&5\end{array}\right] \\

y = (30 × 1 - 9 × 2) ÷ (1 × 5 - 1 × 2)

y = (30 - 18) ÷ (5 - 2)

y = 12 ÷ 3

y = 4

So Philip made 5 bracelets and 4 necklaces.

3 0
3 years ago
Please help me i need help..
I am Lyosha [343]
當我點擊圖片查看答案時,一切都很模糊,我什麼也看不到。拍個更清晰的圖讓我回答一下!!
7 0
2 years ago
Read 2 more answers
the least square yard is 15 yards by 15 yards. how many feet of fencing will they need to buy to fence in all four sides
vekshin1
The answer is 225

plz mark as brainliest. i really need it
6 0
3 years ago
How many minutes is 40% of 2 hours
andrew11 [14]
1 hours is equal to 60 minutes.
2 hours = 120 minutes

40% is 120 minutes = 120*40/100 = 48 minutes
6 0
3 years ago
PLEASEE HELPP IM SO STUPID IDK HOW TO SOLVE THIS ILL GIVE U POINTD AND BRAINLIEST PLEASEEEEEE
scZoUnD [109]

Answer:

3 gallons I am in math club believe it or not

6 0
3 years ago
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