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enot [183]
2 years ago
15

Help me pls thank you :)

Mathematics
1 answer:
suter [353]2 years ago
5 0

Answer:

Step-by-step explanation:

Mode:2

Range:12

Median:3

Mean:4

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The graph of a quadratic function has roots at -3 and -7 and a vertex at (-5, 4). What is the equation of the function in vertex
melomori [17]

Answer:

y = -(x + 5)² + 4

Step-by-step explanation:

The roots are -3 and -7, so:

y = a (x + 3) (x + 7)

Distribute and complete the square:

y = a (x² + 10x + 21)

y = a (x² + 10x + 25 − 4)

y = a (x² + 10x + 25) − 4a

y = a (x + 5)² − 4a

The vertex is (-5, 4), so a = -1.

y = -(x + 5)² + 4

3 0
3 years ago
Solve for x: 5/x^2-4+2/x=2/x-2
IRINA_888 [86]

\dfrac{5}{x^2 - 4} + \dfrac{2}{x} = \dfrac{2}{x - 2}


\dfrac{5}{(x + 2)(x - 2)} + \dfrac{2}{x} = \dfrac{2}{x - 2}


\dfrac{5}{(x + 2)(x - 2)} \times x(x + 2)(x - 2) + \dfrac{2}{x} \times x(x + 2)(x - 2) = \dfrac{2}{x - 2} \times x(x + 2)(x - 2)


5x + 2(x + 2)(x - 2) = 2x(x + 2)


5x + 2(x^2 - 4) = 2x^2 + 4x


5x + 2x^2 - 8 = 2x^2 + 4x


5x - 8 = 4x


x - 8 = 0


x = 8


Now we look at the common denominator.

It is x(x + 2)(x - 2).

x cannot be zero, -2 or 2 because that would cause a zero in the denominator.

Since we get x = 8, and x = 8 does not have to be excluded from the domain, the answer is x = 8.


Answer: x = 8

6 0
3 years ago
Solve by elimination<br> -3x+2y=10<br> -2x-y=-5
Nataly [62]
First you need to get two similar terms to eliminate, I'll do y:
-3x + 2y = 10
-4x - 2y= -10
And then you minus
x = 20
Now you can substitute x in to one of the equations to find y:
-60 + 2y = 10
+ 60
2y = 70
÷ 2
y = 35
So your values are y = 35 and x = 20. Hope this helps!
6 0
3 years ago
7th grade math i mark as brainliest
mamaluj [8]
The answer is 45.5. The image explains why.

5 0
2 years ago
Read 2 more answers
At CVS, the tax paid was $2.45, which was 7% of the cost. What was the cost of the items purch
UNO [17]

'Percentage' is obtained by multiplying 2.45 by - 7%.

- 7% × 2.45 =

(- 7 ÷ 100) × 2.45 =

(- 7 × 2.45) ÷ 100 =

- 17.15 ÷ 100 =

- 0.1715 ≈

- 0.17;

<h2>How do we check the result?</h2>

If - 7% × 2.45 = - 0.1715 =>

Divide - 0.1715 by 2.45...

... And see if we get as a result: - 7%.

<h2>Note:</h2>

100/100 = 100 ÷ 100 = 100% = 1

Multiply a number by the fraction 100/100,

... and its value doesn't change.

n/100 = n%, any number.

8 0
3 years ago
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