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Crank
3 years ago
15

Help with #9 please?

Mathematics
1 answer:
nekit [7.7K]3 years ago
4 0
We're given a parabola

y=x^2-4

and a line

y = 2x+b

The zeros of the parabola are

0=x^2-4

4=x^2

x=\pm 2

We see that (-2,0) is on the line as well:

y = 2x+b

0 = 2(-2)+b

b=4

Choice D


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Rewrite 35 +63 as two factors
mestny [16]
The answer would be the GCF (7), and the sum of the quotients after dividing 35 and 63 by 7 (5 +9=14)  so the answer would be the numbers 7 and 14.
7 0
4 years ago
Josephine solved a quadratic equation. Her work is shown below.
mariarad [96]

Answer:

Step-by-step explanation:

hello :

5(x + 7)² = 245

(x + 7)² = 49

x=0 is solution but you have other solution -14 because :(-14+7)² = (-7)² =49

here is an solution Step-by-step :

(x + 7)² = 49  means : (x + 7)² = 7²

(x + 7)² - 7²=0   use identity : a²-b² = (a-b)(a+b)

a=x+7  and b= 7

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so : x=0 or x= -14

7 0
4 years ago
What is is value of f(8)
Vadim26 [7]

Answer:

Wouldn't it just be 8?

Step-by-step explanation:

f(8)

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8

6 0
3 years ago
A restaurant supplier receives a discount on each oven purchased. The original price of each oven is x dollars. The restaurant s
Sauron [17]

Answer:

Each oven is discounted by $20.

Step-by-step explanation:

Original price of oven in dollars  = x

To find total cost for 9 such ovens without discount we will apply unitary method.

If 1 oven costs in dollars = x

Then 9 ovens will cost in dollars = 9x

The ovens are purchased by a restaurant supplier at some discounted price.

The new price after discount in dollars = 9x-180

We see that the total cost of 9 ovens which was originally =9x has been decreased to =9x-180 after discount.

The decrease amount is the discount amount on 9 ovens which is = $180

To find discount offered on each oven, we will again use unitary method.

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8 0
4 years ago
Which expression can be used to find 20 percent of 90
bixtya [17]

Answer:

18

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1) 90 --- 100%

    x ---   20%

x = 90*20/100 = 18

2)

20 % = 20/100 = 0.2

20 percent (0.2)  of (*) 90 = 0.2*90 = 18

3 0
3 years ago
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