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Anna [14]
3 years ago
7

What is the value of b if (3 + i) and (3 - i) are complex roots of 2x² + bx + 20 = 0?

Mathematics
1 answer:
Bogdan [553]3 years ago
3 0
A is the answer Bc I did this before and my teacher said I did an excellent job!
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PLEASE HURRY!!
Sedaia [141]
Just a moment while I review this
6 0
3 years ago
Shirts are 5% off. The original price of one shirt is $15. What is the total cost, in dollars, of a shirt at the sale price, inc
Juliette [100K]

Answer:

$15.75

Step-by-step explanation:

\frac{y}{15} :\frac{5}{100}

y × 100 = 5 × 15

100y = 75

100y ÷ 100 = 75 ÷ 100

y = 0.75

$15 - $0.75

$14.25

\frac{y}{15} :\frac{10}{100}

y × 100 = 10 × 15

100y = 150

100y ÷ 100 = 150 ÷ 100

y = 1.5

$14.25 + $1.50

$15.75

8 0
3 years ago
The quantities x and y are proportional. Find the constant of proportionality r in the equation y = rx
ELEN [110]

Answer:

r = 7

Step-by-step explanation:

To solve this, we can plug in a pair of x and y values and solve for r.

y = rx | Plug in a pair

42 = r*6 | Now divide both sides by 6

7 = r.

We can test this by plugging in r with a pair.

y = (7)x

77 = 7*11, 77 = 77, This equation is correct.

7 0
3 years ago
Read 2 more answers
I need help pls!
vredina [299]

Answer:

Step-by-step explanation:

7 feet   1 foot is 12 inches

7*12= 84 inches.

None of the choices are correct.

90 inches is 7.5 feet

62.5 inches is 5.2 feet

75 inches is 6.25 feet

4 0
3 years ago
Find the output, y, when the input, x, is -9. <br><br> Y = ?
Monica [59]

When X = -9 Y = 1 you can find this by going to -9 on the x axis and finding where the line is there

5 0
4 years ago
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