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Papessa [141]
2 years ago
8

What is a simpler form of the expression? (2n 2 + 5n + 3)(4n – 5) A. 8n 3 + 10n 2 – 13n – 15 B. 8n 3 + 30n 2 – 37n – 15 C. 8n 3

– 10n 2 + 37n – 15 D. 8n 3 + 13n 2 – 10n – 15
Mathematics
1 answer:
Sonja [21]2 years ago
3 0
<span>(2n^2 + 5n + 3)(4n – 5)
= 8n^3 -10n^2 + 20n^2 - 25n + 12n - 15
= 8n^3 + 10n^2 - 13n - 15 

answer is </span><span>A. 8n^3 + 10n^2 – 13n – 15

hope that helps</span>
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Find the discriminant and the num<br> x2 + 2x + 7 = 0<br> A. 28; two real roots
Helen [10]

Answer:

Discriminant = -24, no real roots.

Step-by-step explanation:

The discriminant is what's inside the square root in the quadratic formula.

The quadratic formula is:

\frac{-b+\sqrt{b^2-4ac} }{2a} and \frac{-b-\sqrt{b^2-4ac} }{2a}

a = 1

b = 2

c = 7

The question wants the discriminate, we can just focus on the square root part.

When we plug in the parts we got, it becomes:

\sqrt{4-4(1)(7)}\\\sqrt{4-28}  \\\sqrt{-24}

Since the inside of the square root is negative, there are no real roots.

5 0
2 years ago
20) The volume of a cone is 1871 cubic feet. If the height of the cone is 6 ft, what is the radius of the cone? (V =
Andrew [12]

Answer:

C

Step-by-step explanation:

Good Luck and I hope you do well :)

5 0
2 years ago
The traffic-control monitor on the freeway shows 200 vehicles per minute passing the camera in 5 minutes. Of those vehicles, on
oksian1 [2.3K]

Answer: maybe 7.5

Step-by-step explanation: I don't really know the question isn't real clear

4 0
2 years ago
What must be true about the discriminant of this quadratic equation for the mentioned values of k? Assume p&gt;0.
Goryan [66]
<span>1/(4p)(x-h)^2+k=0

</span><span>1/(4p)(x-h)^2 = -k
</span>
<span>k(4p)(x-h)^2+1=0

4kp (x^2 - 2xh + h^2) + 1 = 0

4kp x^2 - 8kph x + 4kph^2+1 = 0

D = (-8kph)^2 - 4(4kp)(4kph^2+1) = 64(kph)^2 - 64(kph)^2 - 16kp
D = -16kp < 0

SO discriminant is always less than 0
</span>
4 0
3 years ago
Two drivers are exploring the bottom of a trench in the Pacific Ocean. Dominic is at 175 feet below the surface of the ocean and
mestny [16]

\huge\boxed{\text{Dominic}}

In this problem, 0 represents the sea level. Since Dominic is 175 feet below the surface (sea level), his current location is at -175 feet.

The same concept can be applied to Karen, who is at -138 feet.

We need to find who is lower, or farther below 0. This means the answer is \boxed{\text{Dominic}}.

7 0
3 years ago
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