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3 years ago

7

Mattie uses the discriminant to determine the number of zeros the quadratic equation 0 = 3x2 – 7x + 4 has. Which best describes

the discriminant and the number of zeros?

2 answers:

OlgaM077 [116]3 years ago

7 0

The discriminant is
-7^2- 4(3)(4)
49-48
=1
It is greater than 0 and has 2 unequal real solutions

BabaBlast [244]3 years ago

4 0

Are there any answer choices

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3 years ago

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2 years ago

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3 years ago

The yearly cost y for driving a certain car is $7,800 for 10,000 miles

Licemer1 [7]

Answer:

y = 0.36x + 4200.00

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Step-by-step explanation:

If the yearly cost for driving x miles is given by y dollars then the two ordered pairs to find the linear relation between x and y are (10000,7800) and (20000,11400).

So, the equation will be

$\frac{y - 11400}{11400 - 7800} = \frac{x - 20000}{20000 - 10000}$

⇒ $\frac{y - 11400}{3600} = \frac{x - 20000}{10000}$

⇒ $y - 11400 = \frac{9}{25}(x - 20000)$

⇒ $y - 11400 = \frac{9}{25}x - 7200$

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9636 = 0.36x + 4200

⇒ 0.36x = 5436

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3 years ago