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4 years ago

Combine the like terms to create an equivalent expression:-3z- z

Mathematics

1 answer:

VARVARA [1.3K]4 years ago

5 0

Answer: -4z

Step-by-step explanation:

If you subtract -3 by one, these negatives add up to be -4, making it -4z.

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3 years ago

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3 years ago

Solve the system of equations.

guajiro [1.7K]

Answer:

<u>Option b. (x = 3, y = 20, z = -14)</u>

Step-by-step explanation:

Given:

2x + 2y + 3z = 4

5x + 3y + 5z = 5

3x + 4y + 6z = 5

Solve using Cramer’s rule

∴ $\left[\begin{array}{ccc}2&2&3\\5&3&5\\3&4&6\end{array}\right] =\left[\begin{array}{ccc}4\\5\\5\end{array}\right]$

∴A = $\left[\begin{array}{ccc}2&2&3\\5&3&5\\3&4&6\end{array}\right] = -1$

Ax = $\left[\begin{array}{ccc}4&2&3\\5&3&5\\5&4&6\end{array}\right] = -3$

Ay = $\left[\begin{array}{ccc}2&4&3\\5&5&5\\3&5&6\end{array}\right] =-20\\$

Az = $\left[\begin{array}{ccc}2&2&4\\5&3&5\\3&4&5\end{array}\right] = 14$

∴ x = Ax/A = -3/-1 = 3

y = Ay/A = -20/-1 = 20

z = Az/A = 14/-1 = -14

<u>So, the answer is option b. (x = 3, y = 20, z = -14)</u>

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4 years ago

Which sentence is incorrect? A. -4 > -7 B. 5/2 = 2.5 C. -2.5<-3 D. 2/5 = -0.4

Ket [755]

Answer:

C -2.5<-3

Step-by-step explanation:

since -3 is lower counting wise with negatives the higher the negative the number the more likely its going to be lesser than the other

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3 years ago

Read 2 more answers

If 3 - 2x = 13, then x = -5.

vlada-n [284]

Answer:

True

Step-by-step explanation:

I did the math

5 0

3 years ago

Read 2 more answers

Combine the like terms to create an equivalent expression:-3z- z​

Combine the like terms to create an equivalent expression:-3z- z