1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Zina [86]
3 years ago
8

A door of a lecture hall is in a parabolic shape. The door is 56 inches across at the bottom of the door and parallel to the flo

or and 32 inches high. Sketch and find the equation describing the shape of the door. If you are 22 inches tall, how far must you stand from the edge of the door to keep from hitting your head?

Mathematics
1 answer:
Arada [10]3 years ago
8 0

Answer:

The parabolic shape of the door is represented by y - 32 = -\frac{2}{49}\cdot x^{2}. (See attachment included below). Head must 15.652 inches away from the edge of the door.

Step-by-step explanation:

A parabola is represented by the following mathematical expression:

y - k = C \cdot (x-h)^{2}

Where:

h - Horizontal component of the vertix, measured in inches.

k - Vertical component of the vertix, measured in inches.

C - Parabola constant, dimensionless. (Where vertix is an absolute maximum when C < 0 or an absolute minimum when C > 0)

For the design of the door, the parabola must have an absolute maximum and x-intercepts must exist. The following information is required after considering symmetry:

V (x,y) = (0, 32) (Vertix)

A (x, y) = (-28, 0) (x-Intercept)

B (x,y) = (28. 0) (x-Intercept)

The following equation are constructed from the definition of a parabola:

0-32 = C \cdot (28 - 0)^{2}

-32 = 784\cdot C

C = -\frac{2}{49}

The parabolic shape of the door is represented by y - 32 = -\frac{2}{49}\cdot x^{2}. Now, the representation of the equation is included below as attachment.

At x = 0 inches and y = 22 inches, the distance from the edge of the door that head must observed to avoid being hit is:

y -32 = -\frac{2}{49} \cdot x^{2}

x^{2} = -\frac{49}{2}\cdot (y-32)

x = \sqrt{-\frac{49}{2}\cdot (y-32) }

If y = 22 inches, then x is:

x = \sqrt{-\frac{49}{2}\cdot (22-32)}

x = \pm 7\sqrt{5}\,in

x \approx \pm 15.652\,in

Head must 15.652 inches away from the edge of the door.

You might be interested in
NO EXPLANATION NO BRAINLIEST
erastova [34]

Answer:

60 in.

Step-by-step explanation:

6x5=30 Since the formula of a triangle is A=b/h 30 divided by 2 equals 15. So, 15x4=60.

3 0
3 years ago
Read 2 more answers
Adding and Subtracting Fractions Solve each problem. Write your answer as a mixed number(if possible) 1. 2 1/9 - 7/6= 2. 2/3 + 2
AleksandrR [38]
1) 1 1/6
2) 1  1/6
4) 5  1/ 18

hope you got your answer i didn't know what number 3 was so i did the rest


5 0
3 years ago
Find solution of the equation 3sin^2x-7sinx+2=0
Goshia [24]
Simplife3^2 to 9
9x-7+2=0
9x-7+2to 9x-5
9x-5=0
add 5 to both sides 9x=5
Divide both sides by 9
x=5/9
7 0
3 years ago
Mandy and Pete have a biased spinner numbered 1, 2, 3, 4, 5. They each want to find an estimate for the probability that the spi
kotykmax [81]

Answer:

Pete

Step-by-step explanation:

Given that:

Mandy's Estimate :

Number of spins , n = 20

Pete's Estimate:

Number of spins, n = 200

A good probability estimate is one which has narrow margin of error with a high degree of confidence. These two variables are affected by sample size.

A high sample size give a narrower margin of error and increases the confidence level probability

Based on the sample size used by each of Pete and Mandy, we can conclude that, Pete's probability estimate would be better due to its significantly higher sample size.

5 0
3 years ago
Name four things that you can find on both a dot plot and box plot.
o-na [289]

Answer:Dots, Lines, Box's, and Circles.

Step-by-step explanation: You're welcome

8 0
3 years ago
Other questions:
  • A card is drawn from a standard deck of 52 playing cards. Find the probability that the card is a Jack or a Club.
    10·1 answer
  • Solve and write in interval notation.<br><br> x ≥ 2 and x &lt; -3
    9·1 answer
  • Explain how this is wrong or right please thanks
    12·2 answers
  • What is the probability of selecting two cards from a deck of cards with replacement?
    14·1 answer
  • 10
    8·2 answers
  • Explain why P(A|D) and P(D|A) from the table below are not equal.
    10·2 answers
  • Factor the GCF: 21x3y4 + 15x2y2 − 12xy3.
    14·2 answers
  • Evaluate <br> lim x --&gt; 1 [(x^1000)-1]/[x-1]
    12·1 answer
  • (GIVING BRAINLIEST!!!!!!)
    5·1 answer
  • Can y’all pls help me I need help!!
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!