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insens350 [35]
3 years ago
5

Rewrite f(x) into vertex form by completing the square f(x)=−x2+8x+9​

Mathematics
1 answer:
GalinKa [24]3 years ago
3 0

Answer:

vertex  = ( 4  ,  25 )

Step-by-step explanation:

given a parabola in  standard form  y =  a x 2 + b x + c x ; a ≠ 0

then the x-coordinate of the vertex is

X vertex=-b/2a

y=-x2+8x+9 with a=-1 b=8 c=9

X vertex= -8/-2=4

substitute the value on the equation

Y vertex = -(4)squared+8(4)+9=25

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If 9450 is 16%, how much is 100%
mote1985 [20]

Answer:

59062.50

Step-by-step explanation:

Is means equals

9450 = 16% of a number

9450 = .16 N

divide by .16

9450/.16 = .16N/.16

59062.50 = N

The number is 59062.50

We want 100% of the number which is all of it

59062.50

5 0
3 years ago
What is the length of the unknown
AVprozaik [17]
The answer is A.

Explanation:

Since this is a right triangle you can use The formula: leg squared plus leg squared = hypotenuse squared

So lets square the hypotenuse and first leg
And you get 85 hypotenuse and 49 leg

So just subtract 49 from 85 to get the other leg squares

You get 36 so now just square root it

Square root of 36 is 6

So the best answer is 6

Hope this helps some.
8 0
3 years ago
Colin is working to earn some money for a new CD player. On Saturday he earns half as much as he did on Sunday, but twice as muc
Marysya12 [62]

Answer:

Friday=$10 Saturday=$20 Sunday=$40

Step-by-step explanation:

On Friday we can estimate that he earnt $10 so twice as many as that is $20 so on Saturday he could of earnt that much. Finally what is 20 half of? 40 so 10+20+40=$70

3 0
3 years ago
The drama club is selling tickets to their play to raise money for the show's expenses. Each student ticket sells for $5 and eac
Westkost [7]

80 student tickets and 30 adult tickets must be sold to reach a $700 raise.

Since the drama club is selling tickets to their play to raise money for the show's expenses, and each student ticket sells for $ 5 and each adult ticket sells for $ 10, and the auditorium can hold a maximum of 110 people and the drama club must make a minimum of $ 700 from ticket sales to cover the show's costs, to determine one possible solution the following calculation must be performed:

  • 110 x 5 + 0 x 10 = 550
  • (700 - 550) / (10 - 5) = 150/5 = 30
  • 80 x 5 + 30 x 10 = 400 + 300 = 700

Therefore, 80 student tickets and 30 adult tickets must be sold to reach a $700 raise.

Learn more about maths in brainly.com/question/25901815

7 0
2 years ago
PLEASE HELP ASAP!!!!!<br><br> Rewrite the expression 20x + 25 as the product of two factors.
GaryK [48]

Answer:

<em>5 (4 x + 5)</em>

That is the answer

5 is a factor if 20 and 25 and 4x + 5 cannot be furthor be simplified.

5 0
3 years ago
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