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3 years ago

Explain how you would estimate to subtract 189 from 643

Mathematics

1 answer:

Dima020 [189]3 years ago

5 0

I would just round up to 200 and then subtract twelve or just subtract 200 what ever way u prefer.

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Find all solutions by transforming the system to reduced echelon form and back substituting. (If there are an infinite number of

Zolol [24]

Answer:

The system has infinite solutions described in the set $\{(x_1,x_2,x_3)=(6+s1, -10-2s1,s1): s1\in\mathbb{R}\}$

Step-by-step explanation:

The augmented matrix of the system is $\left[\begin{array}{cccc}-1&-1&-1&4\\2&1&0&2\end{array}\right]$ .

We apply row operations:

1. We add the first row to the second row twice and obtain the matrix $\left[\begin{array}{cccc}-1&-1&-1&4\\0&-1&-2&10\end{array}\right]$

2. multiply by -1 the rows of the previous matrix and obtain the matrix $\left[\begin{array}{cccc}1&1&1&-4\\0&1&2&-10\end{array}\right]$ that is the reduced echelon form of the matrix associated to the system.

Now we aply backward substitution:

1. Observe that the reduced echelon form has a free variable, then the system has infinite solutions.

$x_2+2x_3=-10\\x_2=-10-2x_3$

$x_1+x_2+x_3=-4\\x_1-10-2x_3+x_3=-4\\x_1-x_3=-4+10\\x_1=6+x_3$ .

Then the set of solutions is $\{(x_1,x_2,x_3)=(6+s1, -10-2s1,s1): s1\in\mathbb{R}\}$

3 0

3 years ago

500000000000000000000000000000000000000000000000000

marta [7]

Answer:

do you need help with this

Step-by-step explanation:

4 0

2 years ago

Read 2 more answers

An octagon, a triangle and a circle all have the same perimeter (circumference for the circle). Which is true of the areas of th

icang [17]

O=area of octagon. As its the biggest one. I think its correct just check if any case.

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3 years ago

1. Find simple interest: Principal: 40,000 Rate: 8% Term: 17 months

LUCKY_DIMON [66]

Answer:

54 400

Step-by-step explanation:

40 000×8\100 ×17

=54 400

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1 year ago

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irina1246 [14]

C . A study that relates the relationship

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2 years ago