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emmasim [6.3K]
3 years ago
14

Find the zeros of the function. f(x)=-3x^2+75

Mathematics
2 answers:
Hoochie [10]3 years ago
6 0
Add 3x^2 to both sides. 3x^2=75. Divide by 3 on both sides to get x^2=25. Then square root each side to get x=5 or -5. Hope this helps! ;)
iVinArrow [24]3 years ago
4 0
0=-3x^2+75
3x^2=75
x^2=25
x=+-5

Final answer: x=-5, x=5
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After 85 minutes of calls, there are $27.25 left on the card.

<h3>What is the remaining credit after 85 minutes of calls?</h3>

A linear equation in slope-intercept form is:

y = a*x + b

Where a is the slope.

If the line passes through two points (x₁, y₁) and (x₂, y₂) the slope is:

a = \frac{y_2 - y_1}{x_2 - x_1}

In this case, we know that the line passes through the points (22, 36.7) and (52, 32,20)

(points of the form (time, dollars)).

So the slope is:

a = \frac{32.2 - 36.7}{52 -22} = -0.15

The linear equation is then:

y = -0.15*x + b

To find the value of b, we use the point (22. 36.7)

36.7 = -0.15*22 + b

36.7 + 0.15*22 = b = 40

Then the linear equation is:

y = -0.15*x +40

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y = -0.15*85 + 40 = 27.25

This means that after 85 minutes of calls, there are $27.25 left on the card.

If you want to learn more about linear equations:

brainly.com/question/1884491

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emmasim [6.3K]

Answer:

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Step-by-step explanation:

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Distance= 5/6 mile

time= 3/10 hour.

speed= distance/time

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speed= 5/6*10/3

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