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garri49 [273]
3 years ago
10

Please I need help Will give brainlest answer !!!!!!

Mathematics
1 answer:
Svetach [21]3 years ago
3 0

Answer:

See below ↓

Step-by-step explanation:

We need to check the different time intervals to find the max. height

  1. t = 0 or 1 [both give same result]
  • f(1) = -16(1) + 16(1) + 12 = 12 feet

   2. t = 2

  • f(2) = -16(2)² + 16(2) + 12 = -20 feet

⇒ Clearly as she is diving, her maximum height will be her initial height which is <u>12 feet</u>

⇒ To achieve this, it takes her <u>0 seconds</u> [initial height = no time needed]

<u>Taking f(x) = 0 [surface of water → just touching/hit the water]</u>

  • 0 = -16x² + 16x + 12
  • 4x² - 4x - 3 = 0
  • 4x² - 6x + 2x - 3 = 0
  • 2x(2x - 3) + 1(2x - 3) = 0
  • (2x + 1)(2x - 3) = 0
  • x is positive
  • x = 3/2 = <u>1.5 seconds</u>

<u></u>

⇒ After 1 second, she is <u>12 feet</u> above the water

⇒ The diving board is <u>12 feet</u> above the water

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natulia [17]
To find the mean, add all the numbers together and divide by the amount of numbers there is

89 + 92 + 97 + 81 + 96 = 455

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8 0
3 years ago
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A new building that costs $1,000,000 has a useful life of 10 years and a scrap value of $200,000. Using straight-line depreciati
vazorg [7]

Answer:

V = -80,000*t + 1,000,000

Step-by-step explanation:

Given:

- The original cost V_i = $1,000,000

- Scrap Value V_f = $200,000

- Total number of years n = 10

Find:

Using straight-line depreciation, find the equation for the value V in terms of t, where t is in years.

Solution:

- The straight line depreciation method means their is a linear relationship between the value of building and time elapsed till useful life. The linear relationship takes a form:

                                 V = m*t + C

Where,

V: It is the current value of the building

m: The rate at which value increase or decrease with time t

C: The initial value of the building

- We will compute constants m and C as follows:

                               m = (V_f - V_i) / ( 10 - 0 )

                               m = (200,000 - 1,000,000) / 10

                               m = - $80,000/year

                               C = V_i = $1,000,000

- Plug the values of the constants evaluated above in the linear expression:

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8 0
4 years ago
Help in this question please?
Artyom0805 [142]

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3 years ago
Im not very sure how tot answer this i need help fast
Anna71 [15]
First see if there is a constant rate of change...

(344.8-346)/(2-0)=-0.6

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So the rate is constant which means this is just a line of the form y=mx+b

m=-0.6 and since we see that (0,346) we know the y-intercept, "b", is 346 so our line is:

y(x)=-0.6x+346

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y(9)=340.6


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