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raketka [301]
3 years ago
13

Help in this one please

Mathematics
1 answer:
erik [133]3 years ago
4 0
We need more information
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College algebra ! Help ASAP !!!
Yanka [14]

Answer:

{1}

Step-by-step explanation:

We find determinant for the given matrix and set it equal to -1

To find determinant we apply formula

|A| = a_{11}(a_{22}a_{33} − a_{32}a_{23}) - a_{12}(a_{21}a_{33} − a_{31}a_{23})+a_{13}(a_{21}a_{32} - a_{31}a_{22})

|A| = x(1x - 2) - 0(7-7) + 0(14-7x)

|A| = x^2 - 2x

Now we set the determinant = -1

x^2 - 2x=-1

Add 1 on both sides

x^2 - 2x + 1=0

Now factor it

(x-1)(x-1) = 0

Set each factor =0  and solve for x

x- 1=0 so x=1



8 0
3 years ago
Helppppp pleaseeee!!! Its 5 Marks
alexgriva [62]

Answer:

As the picture shows, we have

V = (x+5)(x-2)x =30x

<=> x(x^2+3x-10) =30x

<=> x^3 + 3x^2-10x-30x = 0(*)

<=> x^3 +3x^2 -40x = 0

<=> x(x-5)(x+8) =0

Solve for (*), there are 3 solution :

5,

0(invalid),

-8(invalid)

=> 3 dimensions of rectangular box: 5, 3, 10

8 0
4 years ago
Read 2 more answers
a diver is swimming at -10 m. He then descends 3m and rises 6m. At what new level is the diver swimming?
iVinArrow [24]
So we start at -10. Because he descends 3 feet, We subtract 3, getting -13. He then rises 6 feet. -13 + 6 = -7. The diver is now at -7 feet. 
7 0
3 years ago
Read 2 more answers
6)<br> x + 87<br> 80°<br> A) 10<br> C) 4.<br> B) 3<br> D) -7
lesya692 [45]

Answer:

D

Step-by-step explanation:

x + 87 = 80

x = -7

87-7 = 80

5 0
3 years ago
Jace invested $8,300 in an account paying an interest rate of 6.6% compounded continuously. Assuming no deposits or withdrawals
kondor19780726 [428]

Answer:

  • $20911

Step-by-step explanation:

<u>Given</u>

  • Investment   P₀ = $8300
  • Interest rate   r = 6.6%
  • Compound = continuous
  • Time   t=14 years
  • P = ?

<u>Formula for continuous compound interest:</u>

  • P = P₀e ^rt, where e = 2.71828, constant used for continuous interest
  • P = 8300*(2.71828)^(14*0.066)
  • P = $20910.57 = $20911 rounded to the nearest dollar

3 0
4 years ago
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