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3 years ago

Solve 3x – 7y = 25 5x – 8y = 27 using matrices. (25, 27) (27, 25) (-1, -4) (4, 1)

1 answer:

8 0

<span>This is somewhat similar to something called Cramer's Rule http://www.1728.org/cramer.htm

A) 3x – 7y = 25
a =3 b=-7 e=25
B) 5x – 8y = 27</span>
c=5 d=-8 f=27

dn = |a b |
      |c d |

dn = |3 -7|
   |5 -8

dn = (3*-8) -(5*-7)

dn = -24 +35

dn = 11

x = |e b|
      |f d|
divided by dn

x = |25 -7|
      |27 -8|
divided by dn

x = -200 -(-189) / 11
x = -11 / 11
x = -1

y = |a e |
   |c f |
divided by dn

y = |3 25|
   |5 27|
divided by dn

y = 81 -125 / dn = -44 / 11 =-4

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A quarter back is sacked for a loss of 5 yards. On the next play, his team loses 15 yards. Then the team gains 12 yards on the t

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The final amount of yards the team has is 8 yards.

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3 years ago

Which question should you expect to be answered with variable data?

Valentin [98]

Answer:

The correct answer is the last one.

Step-by-step explanation:

Variable data is any kind of information gathered that can be made into a chart or graph representing what was collected. In other words, the data collected must vary.

The first, second, and third answers cannot be made into a chart/graph as it would be a singular number, and not provide varying data (which is required to produce a graph/chart).

The last answer would be correct as one can create a chart as the data collected from that question would vary. For example, five family members could be born in July, six in August, and ten in October. The variable that is "varying" would be these months.

Hope this helps!

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3 years ago

See image attached below keeeeeeeeeeeeeeeeeeeed

emmasim [6.3K]

Answer:

.13%

68.26%

2.28%

47.72%

49.87%

34.13%

Step-by-step explanation:

1.) standardize by subtracting the mean and dividng by the standard deviation

(625-1000)/125= -3

go to a ztable to get .0013 or (1-.9987)

this is equal to .13%

2.)

875<x<1125

standardize both seperately and subtract them

(875-1000)/125= -1 whose probability is .1587 (or 1-.8413)

(1125-1000)/125= 1 whose probability is .8413

.8413-.1587= 68.26%

3.)

Find the probability that someone paid less than 1250 and take its compliment

(1250-1000)/125= 2 which has a probability of .9772

take its compliment (1-.9772)= .0228= 2.28%

4.)

Same process as question 2

(750-1000)/125= -2 which has a probability of (1-.9772) = .0228

(1000-1000)/125= 0 which has a probability of .5

.5-.0228= .4772= 47.72%

5.) same deal as the previous question

(625-1000)/125= -3 which has a probability of (1-.9987)= .0013

(1000-1000)/125= 0 which has a probability of .5

.5-.0013= .4987= 49.87%

6.)same deal the previous question

(875-1000)/125= -1 which has a probability of (1-.8413)=.1587

(1000-1000)/125= 0 which has a probability of .5

.5-.1587= .3413= 34.13%

4 0

3 years ago

A cereal box is a rectangular prism that is 8 inches long and 2 1/2 inches wide. the volume of the box is 200 inches cubed. what

Archy [21]

You have to multiply 8 and 2 1/2 which is 20. Then divide 20 and 200. Then you get 10 and that is your answer.

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3 years ago

Solve for m.<br> 4m^n = 49

Sever21 [200]

Answer:

m=49/4

Step-by-step explanation:

7 0

3 years ago