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Murrr4er [49]
1 year ago
9

There are a total of 66 students in the

Mathematics
1 answer:
attashe74 [19]1 year ago
7 0

Answer:

A = 26

Step-by-step explanation:

sum of students = classA + classB + classC

let's say classA = A, classB = B, and classC = C

A + B + C = 66

class A has five more students than class B, so A = 5 more than B so A = 5+B

class C has 2 less students than class B, so C = 2 less than class B = B -2, so C = B-2

A + B + C = 66

A = 5+B

C = B-2

substitute 5+B for A and B-2 for C in the first equation to limit this to one variable (B)

(5+B) + B + (B-2) = 66

3B + 3 = 66

subtract 3 from both sides to isolate the variable and its coefficient

3B = 63

divide both sides by 3 to solve for B
B = 21

A = 5 + B = 5 + 21 = 26

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Gale's Shipping Company Cost, y=$(3+5x)

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Step-by-step explanation:

Let the number of pounds being shipped=x

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Gale's Shipping Company Cost =  $3.00 + ($5.00 X Number of Pounds)

Gale's Shipping Company Cost, y=$(3+5x)

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Step-by-step explanation:

3 0
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PLEASE HELP I'm having trouble ​
Anastasy [175]

Answer:

c_{11}=56.1

c_{12}=12.1

c_{13}=236

Step-by-step explanation:

  • The product of two matrices X_{m\times{n}} and  Y_{n\times{r}} equals a matrix M_{m\times{r}}, where the first element of the subscript represents the amount of files of the matrix and the second element represents the amount of columns of the matrix.
  • Then, in this case  A_{1\times{3}}   B_{3\times{3}}, therefore, its product will result a matrix C_{1\times{3}}.
  • Because C matrix is going to have an only file and three columns, we now have to find the values of the elements in each column, based on the elements of A and B.
  • Commonly, to obtain the values of the resulting matrix, we just have to multiply each file of the first matrix by each column of the second matrix and sum, as follows:
  1. c_{11}=77\times1.2+39\times2.2-33\times3.7=56.1
  2. c_{12}=77\times1.4+39\times1.1-33\times4.2=12.1
  3. c_{13}=77\times3.1+39\times5.6-33\times6.7=236
  • Finally, C matrix is \begin{pmatrix}\56.1 & 12.1& 236\end{pmatrix}
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Answer:

I think its B

Step-by-step explanation:

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