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Kipish [7]
3 years ago
15

Which matrix best represents the system of equations below?

Mathematics
1 answer:
Effectus [21]3 years ago
6 0

\left\{\begin{array}{ccc}-10x-9y+13z=12\\8x-7y-5z=15\\5x+4y-6z=-12\end{array}\right\\\\\begin{array}{ccc}\ \ \ \ x&\ \ \ y&\ \ z\end{array}\\\left[\begin{array}{ccc|c}-10&-9&13&12\\8&-7&-5&15\\5&4&-6&-12\end{array}\right]

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PLS HELP ME ASAP FOR 10 and 11 (MUST SHOW WORK!!!) + LOTS OF POINTS!!
sasho [114]
Problem 10:
Step One: Write the expression
When a problem says some number (in this case 17) more than a variable it almost always refers to addition.  So we know that the expression's operation is addition.  We are adding 17 to our variable, n. It should look like this:
n + 17
Step Two: Replace n with a Number
Pick your favorite number and replace n with that number.  For simplicity's sake, I will choose the number 2.  So n + 17 becomes:
17 + 2
Notice how n has been replaced with our number.  Remember n could be any number, but I chose 2.
Step Three: Simplify the expression.
17 + 2 becomes 19

Problem 11:
Step One: Write the Expression
The first part of our expression is: g =
G represents the total cost of Paresh's day at the bowling alley, including all 5 games and shoe rental.
We know that to rent shoes, it cost Paresh 4 dollars.  That becomes the second part of our expression.  So now we have:
g = + 4
We also know that he played 5 games of bowling, but we don't know how much Paresh paid per game.  So to represent the cost of each individual game, we will use the variable x.  He played 5 games, so the third and final part of our expression is 5x.  So our final result is:
g = 5x + 4

4 0
3 years ago
What is (-i)^5? A. -1. B. 1. C. I D-i
nika2105 [10]

Answer:

D

Step-by-step explanation:

(-i)⁵ can be written as (-i)² * (-i)² * (-i). Since (-i)² is the same as i², this equals -1 * (-1) * (-i) which becomes -i.

3 0
4 years ago
In a polling station, there were 900 registered voters. During an election 10% of the registered voters did not cast their votes
ANEK [815]

Answer:

Ahmed got 390 votes

Step-by-step explanation:

Here, we want to know the number of votes obtained by Ahmed

from the question, there were 900 registered voters

10% did not cast their votes

The number that didn’t cast their votes will be;

10% of 900

= 10/100 * 900 = 90

So the rest 90% casted and this value will be 900-90 = 810

810 people casted their votes

30 votes were spoilt;

The number of valid votes is thus;

810 - 30 = 780

Ahmed got a ratio of 3 in 3:2:1

The total value here is 3 + 2 + 1 = 6

So what Ahmed got will be;

3/6 * 780

= 780/2 = 390

3 0
3 years ago
The sum of 6 consecutive integers is 519. What is the third number in this sequence?
egoroff_w [7]
<span>let x be the first integer, then
:
x + (x+1) + (x+2) + (x+3) + (x+4) + (x+5) = 519
:
6x + 15 = 519
:
6x = 504
:
x = 84</span>
5 0
3 years ago
Read 2 more answers
The surface area of a cylinder is 140 pie square feet, and its height is 9 feet. find its radius
cricket20 [7]

Answer:

the radius is 2.02

Step-by-step explanation:

use the formula to solve the radius of a cylinder

8 0
2 years ago
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