What is the sum of 5/8+3/10

Mathematics

2 answers:

FrozenT [24]2 years ago

7 0

Change 5/8 and 3/10 so they have the same denominator

5/8×5/5=25/40

3/10×4/4=12/40

25/40+12/40=37/40

5/8+3/10=37/40

MAXImum [283]2 years ago

5 0

You first change the fractions so their denominators are the same:
5/8×5/5=25/40
3/10×4/4=12/40
Then you add the two sums up:
25/40+12/40=37/40
You just add the numerator. You don't have to add the denominators.

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2 years ago

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Help please!!!!!!!!!

In-s [12.5K]

ANSWER

EXPLANATION

For a matrix A of order n×n, the cofactor $C_{ij}$ of element $a_{ij}$ is defined to be

$C_{ij} = (-1)^{i+j} M_{ij}$

$M_{ij}$ is the minor of element $a_{ij}$ equal to the determinant of the matrix we get by taking matrix A and deleting row i and column j.

Here, we have

$C_{11} = (-1)^{1+1} M_{11} = M_{11}$

M₁₁ is the determinant of the matrix that is matrix A with row 1 and column 1 removed. The bold entries are the row and the column we delete.

$\begin{aligned} A=\begin{bmatrix} \bf 1 & \bf -6 & \bf -4\\ \bf 7 & 0 & -3 \\ \bf -9 & 8 & -8 \end{bmatrix} \implies M_{11} &= \text{det}\left(\begin{bmatrix} 0&-3 \\ 8&-8 \end{bmatrix} \right) \end{aligned}$