2 years ago

Find the equation of the axis of symmetry and the coordinates of the vertex of the graph of the function y = 4x2 + 5x - 1.

Mathematics

1 answer:

Vilka [71]2 years ago

6 0

Answer:

You are correct. The answer is the blue point marked

Step-by-step explanation:

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In 2009, the American Time Use Survey found that the average American spends 2.8 hours a day watching TV. Suppose the standard d

Anit [1.1K]

Answer:

4.72 hours/day

Step-by-step explanation:

Mean time spent watching TV (μ) = 2.8 hours a day

Standard deviation (σ) = 1.5 hours a day

The 90th percentile (upper 10%) of a normal distribution has an equivalent z-score of roughly z = 1.282. The minimum time spent watching TV, X, at the 90th percentile is:

$z=\frac{X-\mu}{\sigma} \\1.282=\frac{X-2.8}{1.5}\\ X=4.72\ hours/day$

On a typical day, you must watch at least 4.72 hours of TV to be in the upper 10%.

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2 years ago

The ratio of the length of the corresponding sides of two rectangles is 5:8. The area of the smaller rectangle is 130 m2. To the

xxMikexx [17]

I think the answer is 332.8 cm^2

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2 years ago

Read 2 more answers

The standard form of the equation of a parabola is x-y^2+10y+22.what is the vertex form of the equation?

neonofarm [45]

x = y^2 + 10y + 22

Divide 10 by 2 to give 5 which becaoses the second term in the parentheses

x = (y + 5)^2 - 25 + 22

x = (y + 5)^2 - 3 Answer.

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2 years ago

Joey collects baseball cards. He already has 245 and for his birthday, each of his 12 friends bought him 25 more. How many baseb

lina2011 [118]

Answer:545 baseball cards

Step-by-step explanation:hope this helps!

6 0

2 years ago

Lim (x+1) (3x^2-9)<br> X2

mafiozo [28]

Answer:

$\lim_{x \to 2} (x+1)(3x^2-9) = 9$

Step-by-step explanation:

Step 1: Write out limit

$\lim_{x \to 2} (x+1)(3x^2-9)$

Step 2: Evaluate

(2 + 1)(3(2)² - 9)

3(3(4) - 9)

3(12 - 9)

3(3)

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2 years ago