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Semenov [28]
3 years ago
7

Evaluate the determinant for the following matrix: Please help !!!

Mathematics
1 answer:
Step2247 [10]3 years ago
5 0
The answer would be A
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Hi Guys , could you help me with this question. Thank you xx
Nesterboy [21]

Answer:

A ≈ 3420 cm²

Step-by-step explanation:

The area (A) of a circle is calculated as

A = πr² ( r is the radius ) , then

A = π × 33² = 1089π ≈ 3420 cm² ( to 3 significant figures )

8 0
3 years ago
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Solve the system be either substitution or elimination 3x-5y=21 and 2x+y=1
IRISSAK [1]

Answer:

(2,-3)

Step-by-step explanation:

I used substitution and rearranged the second equation to y=-2x+1. Then I replaced the y in the first equation with -2x+1. So, I got 3x-5(-2x+1)=21. When you solve that you get 13x=26 or x=2. Then you replace x with 2 in either equation and end up with y=-3.

4 0
4 years ago
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The radius of a sphere is measured to be 3.12 cm what is the most accurate volume of a sphere you can report
wlad13 [49]
Answer is 127.15

to google the formula of volume of sphere
6 0
3 years ago
A school fair ticket costs $8 per adult and $1 per child. On a certain day, the total number of adults (a) and children (c) who
Nadusha1986 [10]
$88 adults and $12 children
5 0
3 years ago
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Add the equations. What value belongs in the green box? 3x + 2y = 9 -x - 2y = 4 [?] + [?] = [?] A. 4x B. 2x C. -3x D. -2x​
Naddika [18.5K]

Consider the first blank is the green box.

Given:

The equations are

3x+2y=9

-x-2y=4

To find:

The value belongs in the green box

Solution:

We have,

3x+2y=9        ...(i)

-x-2y=4        ...(ii)

Adding (i) and (ii), we get

3x+2y-x-2y=9+4

(3x-x)+(2y-2y)=13

2x+0=13

So, the value for the first black is 2x. It means the value belongs in the green box is 2x.

The values of three blanks are 2x, 0 and 13 respectively.

Therefore, the correct option is B.

6 0
3 years ago
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