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Andrej [43]
3 years ago
9

The graph shows motion of a train. Enter a value to complete the statement

Mathematics
2 answers:
olya-2409 [2.1K]3 years ago
8 0

Answer:

25, i had the same question

schepotkina [342]3 years ago
4 0

Answer:25

Cause it is I tried it

Step-by-step explanation:

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Tom was using wire of the following thicknesses .33 mm, .275 mm, .25 mm, and .3 mm for some electrical work. Order the wire from
Lubov Fominskaja [6]
.3, .25, .33, .275 is your answer
3 0
3 years ago
Read 2 more answers
Suppose you roll n ≥ 1 fair dice. Let X be the random variable for the sum of their values, and let Y be the random variable for
noname [10]

<u>Answer:</u>

X and Y are stochastically dependent RVs .

<u>Step-by-step explanation:</u>

Let ,

X = sum of the values that come up after throwing n (≥ 1) fare dice.

Y = number of times an odd number come up.

Let, n = 3

then, P(X =6) = p (say) clearly 0 < p < 1

and P (Y = 3) = \frac{1}{8}

And,

P( X = 6, Y = 3) = 0  ≠ P(X = 6) \times P(Y= 3)

Hence, X and Y are stochastically  dependent  RVs

3 0
3 years ago
Someone please help Me! Solve each system of equation. I need help I don’t understand and this is due tomorrow. I’ll make brainl
mestny [16]

Answer:

  (a, b, c) = (-2, -3, 5)

Step-by-step explanation:

The idea is to find values of a, b, and c that satisfy all three equations. Any of the methods you learned for systems of 2 equations in 2 variables will work with 3 equations in 3 variables. Often, folks find the "elimination" method to be about the easiest to do by hand.

Here, we notice that the coefficients in general are not nice multiples of each other. However, the coefficient of "a" in the second equation is 1, so we can use that to eliminate "a" from the other equations.

__

Add 3 times the second equation to the first.

  3(a +3b -4c) +(-3a -4b +2c) = 3(-31) +(28)

  3a +9b -12c -3a -4b +2c = -93 +28 . . . . eliminate parentheses

  5b -10c = -65 . . . . . . . . . . . . . . . . . . . . . . .collect terms

  b - 2c = -13 . . . . . . . divide by 5 (because we can) "4th equation"

Subtract 2 times the second equation from the third.

  (2a +3c) -2(a +3b -4c) = (11) -2(-31)

  2a +3c -2a -6b +8c = 11 +62

  -6b +11c = 73 . . . . . . "5th equation"

Now, we have two equations in b and c that we can solve in any of the ways we know for 2-variable equations. Once again, it looks convenient to use the first of these (4th equation) to eliminate the b variable. (That is why we made its coefficient be 1 instead of leaving it as 5.)

Add 6 times the 4th equation to the 5th equation:

  6(b -2c) + (-6b +11c) = 6(-13) +(73)

  6b -12c -6b +11c = -78 +73 . . . . . . . eliminate parentheses

  -c = -5 . . . . . . . . . . . . . . . . . . . . . . . . collect terms

  c = 5 . . . . . multiply by -1

We can now work backwards to find the other variable values. Substituting into the 4th equation, we have ...

  b -2(5) = -13 . . . .substitute for c

  b = -3 . . . . . . . . . add 10

And the values for b and c can be substituted into the 2nd equation.

  a + 3(-3) -4(5) = -31

  a -9 -20 = -31 . . . . . eliminate parentheses

  a = -2 . . . . . . . . . . . . add 29

__

The solution to this set of equations is (a, b, c) = (-2, -3, 5).

_____

<em>Comment on steps</em>

At each stage, we made choices calculated to simplify the process. By using equations that had a variable coefficient of 1, we avoided messy fractions or multiplying by more numbers than necessary when we used the elimination process. That is, the procedure is guided by the idea of <em>elimination</em>, but the specific steps are <em>ad hoc</em>. Using <em>these same specific steps</em> on different equations will likely be useless.

_____

<em>Alternate solution methods</em>

The coefficients of these equations can be put into the form called an "augmented matrix" as follows:

\left[\begin{array}{ccc|c}-3&-4&2&28\\1&3&-4&-31\\2&0&3&11\end{array}\right]

Many graphing and/or scientific calculators are able to solve equations written in this form. The function used is the one that puts this matrix into "reduced row-echelon form". The result will look like ...

\left[\begin{array}{ccc|c}1&0&0&-2\\0&1&0&-3\\0&0&1&5\end{array}\right]

where the rightmost column is the solution for the variables in the same order they appear in the equations. The vertical line in the body of the matrix may or may not be present in a calculator view. The square matrix to the left of the vertical bar is an identity matrix (1 in each diagonal element) when there is exactly one solution.

6 0
3 years ago
a recipe calls for 14 ounces os shredded cheddar cheese. How many cups of shredded cheddar cheese should a revised recipe call f
NNADVOKAT [17]
You’d need to put 1.75pt of cheese because 14/8=1.75.
hope this helped.
7 0
3 years ago
Manuel collects $39.18 for a fundraiser. Gerome collects $15.07 more than Manuel. Cindy collects 2 times as much as Gerome. How
Lesechka [4]

Answer:

108.3

Step-by-step explanation:

15.07 + 39.18 = 54.25 x 2= 108.5

4 0
3 years ago
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