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sammy [17]
3 years ago
6

Find the quadratic function that has a vertex at (−2,−4) and goes through the point (−1,−5).

Mathematics
1 answer:
zavuch27 [327]3 years ago
4 0

Answer:

y=-x^2-4x-8 or  y=-(x+2)^2-4

Step-by-step explanation:

First use the vertex form(because you have vertex point)

y=a(x+2)^2-4

Then, plug in the point(-1,-5) to find the equation

-5=a(-1+2)^2-4

-5=a-4

a=-1

y=-(x+2)^2-4 = -x^2-4x-4-4 = -x^2-4x-8

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Ida needs to hire a singer for her wedding. Singer A is offering his services for an initial $65 in addition to $13.15 per hour.
Naddik [55]

Answer:

4.4 hours

Step-by-step explanation:

Let the number of hours = x

Ida needs to hire a singer for her wedding.

For Singer A

Singer A is offering his services for an initial $65 in addition to $13.15 per hour.

65 + 13.15x

Singer B

Singer B is offering her services for an initial $73 in addition to $11.35 per hour.

73 + 11.35x

We equate both singers together

Singer A = Singer B

65 + 13.15x = 73 + 11.35x

We collect like terms

13.15x - 11.35x = 73 - 65

1.8x = 8

x = 8/1.8

x = 4.4444444444 hours

Approximately = 4.4 hours

The two singers will charge the same amount of money after 4.4 hours

5 0
3 years ago
At 3 pm., the temperature is 12 f . It then dropping 2 F every hour for 7 hours. What was the temperature after 7 hours ?
andriy [413]

Answer:

-2

Step-by-step explanation:

12 -2 x 7 = -2

3 0
4 years ago
What kind of sequence is this equation y=400*2^x (arithmetic,geometric,nethier)
GalinKa [24]

Answer:

Geometric

Step-by-step explanation:

starting point : 800

800 , 1600 , 3200

Good luck .

8 0
3 years ago
Whats the algebraic expression that describes 1, 4, 7, 10, 13. And how?
bearhunter [10]

The answer would be c)x+3 because if you substitute 1 for x, the expression would be 1+3 and it comes out as 4. Also, if you substitute 4 for x the expression would be 4+3 which comes out to 7

Hope this helps!

5 0
3 years ago
I need help with this math,
blagie [28]

Answer:

Step-by-step explanation:

x + -4 + -2 (3x - 5) = x + -4 + -2 (3x + <u>-5</u>)

= x + -4 + <u>-6x</u> + <u>10</u>

= (x + <u>-6x</u>) + (-4 + <u>10</u>)

= (-5x) + (6)

= <u>-5</u>x + <u>6</u>

8 0
3 years ago
Read 2 more answers
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