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natta225 [31]
4 years ago
12

The discriminant of x2 + 6x + 9 = 0

Mathematics
1 answer:
Readme [11.4K]4 years ago
4 0

Answer:

D = 0

Step-by-step explanation:

D = b^2 - 4ac =

= 6^2 - (4*1*9) =

= 36 - 36 = 0

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Solve for x. 4(2-x)+13=2x+3
gregori [183]

Answer:

x = 3

Step-by-step explanation:

4(2-x)+13=2x+3

distribute the 4.

8 - 4x + 13 = 2x + 3

combine like terms.

21 - 4x = 2x + 3

18 = 6x

divide by 6.

x = 3

check.

4(2 - 3) + 13 = 2(3) + 3

4(-1) + 13 = 6 + 3

-4 + 13 = 9

9 = 9

correct!

4 0
3 years ago
Is {(5, 12), (-4,9), (-2,-7), (-4,0), (3, 2)}<br> A function? Please help me
Anna71 [15]

Answer:

Not a function

Step-by-step explanation:

(-4,9), (-4,0)   : one input (-4) with 2 output -9 , 0

6 0
3 years ago
A submarine travels 168 miles in 7 hours. At this rate, how many miles will the submarine travel in 2 1/2
Damm [24]

Answer:

Step-by-step explanation:

(168 mi)/(7 hr) = (24 mi)/hr

(2.5 hr) × (24 mi)/hr = 60 mi

3 0
3 years ago
The value of a house has increased by $4,200 in the past year. By what percent has the value increased if the value last year wa
IgorC [24]

Answer:

The value has increased by <u>8 percent</u>.

Step-by-step explanation:

Given:

The value of a house has increased by $4,200 in the past year.

The value last year was $52,500.

Now, to find the percent increased.

<em>Value of house = $52,500.</em>

<em>Value of house last year increased by = $4200.</em>

So, to get the percent increased:

\frac{Value\ of\ house\ last\ year\ increased\ by} {Value\ of\ house}\times 100.

=\frac{4200}{52500} \times 100

=0.08\times 100

=8\ percent.

Therefore, the value has increased by 8 percent.

6 0
3 years ago
A rectangle has length (3x-8) and width (2x-7) cm .Write down and simplify an expression for the perimeter of the rectangle. So
tatuchka [14]

Answer:

The perimeter of the rectangle is equal to (10x-30)\ cm

Step-by-step explanation:

Let

L-----> the length of the rectangle

W ----> the width of the rectangle

we know that

The perimeter of rectangle is equal to

P=2(L+W)

we have

L=(3x-8)\ cm\\W=(2x-7)\ cm

substitute

P=2((3x-8)+(2x-7))

P=2(5x-15)

P=(10x-30)\ cm

8 0
4 years ago
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