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Readme [11.4K]
3 years ago
12

what score must a student make on an algebra test to have an average score of 90 for the grading period. If his other test score

s are 88, 84, and 92?
Mathematics
1 answer:
Alborosie3 years ago
5 0
At least a 96 is needed for a 90
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Rewrite the decimal 47.4 as a mixed number
prohojiy [21]

Answer:

47 and 2/5

Step-by-step explanation:

8 0
3 years ago
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Solve for both systems: y+7z=22 and 8y + 7z = 127
7nadin3 [17]
Manipulate the first equation to
y = 22-7z

Then substitute in the second to find z
8(22-7z) + 7z = 127
176-56z+7z = 127
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So y = 22-7(1) = 22-7 = 15

y = 15; z = 1
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2 years ago
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Cory, Josh and Dan went shopping for Halloween treats. Cory bought 3 chocolate pumpkins, 4 masks and 8 candy witches. He spent $
bija089 [108]

Answer:

The cost of chocolate pumpkins is $1.89, masks cost $5.75 and candy witches cost $1.62

Step-by-step explanation:

Let x represent the cost of chocolate pumpkins, y the cost of masks and z the cost of candy witches.

Cory shopping can be represented as:

3x + 4y + 8z = 41.63      (1)

Josh shopping can be represented as:

6x + 2y + 14z = 45.52    (2)

Dan shopping can be represented as:

8x + 3y + 25z = 72.87    (3)

The equations in matrix form is:

\left[\begin{array}{ccc}3&4&8\\6&2&14\\8&3&25\end{array}\right] \left[\begin{array}{c}x\\y\\z\end{array}\right] =\left[\begin{array}{c}41.63\\45.52\\72.87\end{array}\right] \\\\\\\left[\begin{array}{c}x\\y\\z\end{array}\right] =\left[\begin{array}{ccc}3&4&8\\6&2&14\\8&3&25\end{array}\right] ^{-1}\left[\begin{array}{c}41.63\\45.52\\72.87\end{array}\right] \\\\\\\left[\begin{array}{c}x\\y\\z\end{array}\right] =\left[\begin{array}{c}1.89\\5.75\\1.62\end{array}\right]

The cost of chocolate pumpkins is $1.89, masks cost $5.75 and candy witches cost $1.62

7 0
2 years ago
Which numbers in set A = {-7,-4,2,14,21,34,42} are elements of both set B and set C, shown below?
gulaghasi [49]

Answer:

Hey there!

The numbers in set A and B are 14, and 42.  

Let me know if this helps :)

8 0
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If you spent 58 minutes doing English homework and 47 minutes doing math homework how much more time did you need to spend doing
agasfer [191]

Answer:

58 minutes

Step-by-step explanation:

Please brainliest me

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2 years ago
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