Help for finals for brainlist

Use Cramer's Rule to find the determinant of the coefficient matrix of this system of equations.

Andrew [12]

Answer:

Determinant = -12

Step-by-step explanation:

rewrite the system as

-2 = 2x - 3y + 0z

0 = 0x + y - 2z

1 = -3x + 2y - z

then the coefficient matrix is

{ [2, -3, 0]

[0, 1, -2]

[-3, 2, -1] }

to find determinant

{ [2, -3, 0] , 2, -3

[0, 1, -2] , 0, 1

[-3, 2, -1] }, -3, 2

determinant = 2*1*-1 + (-3 * -2 * -3) + (0*0*2) - 0 - (2*-2*2) - 0

determinant = -2 - 18 + 0 - 0 + 8 = -12

3 0

3 years ago

9. Noel Devine bought a new dishwasher for $320. He paid $20 down and made 10 monthly payments of $34. What actual yearly intere

natulia [17]

Amount financed
320-20=300
Total paid
34×10=340
Interest
340-300=40
Interest rate
((2×12×40)÷(300×11))×100
=29.09%

Hope it helps

5 0

4 years ago

Read 2 more answers

How many terms are to be considered in the series with first term - 3 and common ratio r = -4 for the sum to exceed 1507

Artemon [7]

Step-by-step explanation:

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7 0

3 years ago

Please Help!!!!!!!!!!!

vitfil [10]

Answer:

D

Step-by-step explanation:

AREA = B x W.

<em>8cm x 7cm = 56 cm^2</em>

3 0

3 years ago

Read 2 more answers

A phone company offers two monthly plans. Plan A costs $8 plus an additional $0.09 for each minute of calls. plan B cost $16 plu

harina [27]

Answer: 72

Plan A = 30 +0.15x

Plan B = 16 +0.20x

30+0.15x = 16+0.20x

subtract 16 from each side

14 +0.15x = 0.20x

subtract 0.15x from each side

14=0.05x

x = 14/0.05 = 280 minutes

280*0.15 = 42 +30 = $72

280 * 0.20 = 56 +16 = 72

280 minutes and cost $72 each

Step-by-step explanation:

5 0

3 years ago