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ch4aika [34]
3 years ago
6

Hello! Please answer this question with all of the info it is asked for. Please be sure to include all of your work and share an

y of your thoughts you had when solving. Please do not answer unless you know the answer. Thanks! Good Luck!
A golf ball is launched straight up into the air from the ground with an initial velocity of 160 ft/s. The function that models the ball's height is: h(t) = -16t^2 + 160t.

a) Find how long it takes for the golf ball to reached its maximum height.

b) Determine how long the golf ball is in the air before it hits the ground.

c) Determine the maximum height that the golf ball reaches.
Mathematics
1 answer:
vova2212 [387]3 years ago
7 0

Answer:

  • a) 5 sec
  • b) 10 sec
  • c) 400 m

Step-by-step explanation:

<u>Given is the quadratic function:</u>

  • h(t) = -16t^2 + 160t

<u>This gets maximum value at vertex, which is achieved at:</u>

  • x = -b/2a, of y = ax^2 + bx + c

<u>In our case:</u>

  • t = -160/2(-16) = 5 seconds

<u>Maximum height is at vertex:</u>

  • h(5) = -16*5^2 + 160*5 = 400 m

<u>Time the ball hits the ground, h(t) = 0:</u>

  • -16t^2 + 160t = 0
  • t^2 - 10t = 0
  • t(t - 10) = 0
  • t = 0 seconds is the starting point
  • t = 10 seconds is when the ball hits the ground
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I really need help with 1 and 2 please help me I begg you
Lera25 [3.4K]
1.) So 1/5 of a relay, or r, is 3/4 of a mile.
1/5r = 3/4
Multiply 5 on both sides of the equation.

r = 15/4

The relay was 15/4 of a mile or 3 3/4 of a mile.

2.) No, it is not because the sum of the digits are not divisible by 3.

Hope this helps! :)
7 0
3 years ago
Read 2 more answers
Determine the equation of the circle graphed below. <br><br> ( please help me )
shepuryov [24]

Answer:

(x - 3)² + (y + 5)² = 10

Step-by-step explanation:

The equation of a circle in standard form is

(x - h)² + (y - k)² = r²

where (h, k) are the coordinates of the centre and r is the radius

Here (h, k) = (3, - 5 ) , then

(x - 3)² + (y - (- 5) )² = r² , that is

(x - 3)² + (y + 5)² = r²

r is the distance from the centre to a point on the line

Calculate r using the distance formula

r = \sqrt{(x_{2}-x_{1})^2+(y_{2}-y_{1})^2    }

with (x₁, y₁ ) = (3, - 5) and (x₂, y₂ ) = (6, - 4)

r = \sqrt{(6-3)^2+(-4+5)^2}

  = \sqrt{3^2+1^2}

  = \sqrt{9+1}

   = \sqrt{10} ⇒ r² = (\sqrt{10} )² = 10

(x - 3)² + (y + 5)² = 10 ← equation of circle

6 0
3 years ago
10 points, need these answers filled in!
Ksju [112]

Answer:


Step-by-step explanation:

a) If events A and B are independent we have

P(A/B) =P(A)

But here P(A/B) = 0.8 and P(A)=0.2

Hence A and B are not independent.

b) If events A and B are independent we have

P(A/B) =P(A)

But here P(A/B) = 0.6 and P(A)=0.3

Hence A and B are not independent.

c) If events A and B are independent we have


P(A/B) =P(A)

Jere P(A/B) = 0.5 and P(A)=0.5

Hence A and B are  independent.

4 0
4 years ago
Needs to be in fraction form and simplified <br><br> 3 4/5 + 4 5/6 =? <br><br> 10 points
LenaWriter [7]

Answer:

259/30 or 8 19/30 depending on what format your teacher wants the answer

Step-by-step explanation:

First we can turn both mixed fractions into improper fractions and to do that we multiply the whole number by the denominator and that add that to the top number.  So for 3 4/5 we would multiply 3 and 5 and than add 4 getting us to 19/5 doing the same to 4 5/6 gets us to 29/6.  Now in order to add fractions we need to get a common denominator.  The least common multiple of 5 and 6 is 30 so we will multiply each fraction by whatever number will give us 30 in the denomiator.  for 19/5 that number is 6 so our new fraction is 114/30 and for 29/6 that number is 5 so our new number is 145/30.  Now we just add the numerators and simplify.  114/30+145/30=259/30

I hope this helps and please don't hesitate to ask if there is anything still unclear!

6 0
3 years ago
A. 5 ft 1 in. to 5 ft 6 in.<br> Find the percent<br> Plssss...I will give u Brainliest
rjkz [21]

Answer:

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Step-by-step explanation:

8 0
3 years ago
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