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lisov135 [29]
3 years ago
10

Fill in the box with any number that will create a quadratic function with zeros at -1 and 3.

Mathematics
1 answer:
Sergeeva-Olga [200]3 years ago
3 0

Answer:

3x^2 - 6x - 9

Step-by-step explanation:

In order to make the function have zeros at -1 and 3 it needs to factor into:      

<u>To make that:</u>

3x^2 - 6x - 9

(3x - 9)(x + 1)

<u>To check:</u>

3x - 9 + 9 / 3 = 0 + 9 / 3

x = 3

x + 1 - 1 = 0 - 1

x = -1

So, it is correct.  

Answer:  3x^2 - 6x - 9

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C. $97

Step-by-step explanation:

The average of his wage for all 15 days is the sum of all wages for the 15 days divided by 15.

average wage for 15 days = (sum of wages for the 15 days)/15

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average wage: $87

number of days: 7

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Last 7 days:

average wage: $92

number of days: 7

total wages in last 7 days = 7 * $92/day = $644

8th day:

wages of the 8th day is unknown, so we let x = wages of the 8th day

total wages of 15 days = (wages of first 7 days) + (wages of 8th day) + (wages of last 7 days)

total wages of 15 days = 609 + x + 644 = x + 1253

average wage for 15 days = (sum of wages for the 15 days)/15

average wage for 15 days = (x + 1253)/15

We are told the average for the 15 days is $90/day.

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