Can anybody help me with this bellwork?

2 answers:

6 0

First, find the amount of time is taken to travel 1 mile :
time taken to travel 1 mile = 20/6 = 3 ⅓ mins
hence, time taken to travel 9 miles = 3 ⅓ x 9 = 30 mins

time taken to travel 10 miles = 3 ⅓ x 10 = 33 ⅓ mins

wel3 years ago

4 0

Answer:

1. 30 minutes to walk 9 miles.

2. 33.33 minutes to walk 10 miles.

Step-by-step explanation:

I divided 20 by 6, and got 3.33. If you multiply 3.33 by 9 you get 30, and if you multiply 3.33 by 10 you get 33.33.

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nata0808 [166]

Answer:

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Step-by-step explanation:

Given equation:

$h=-5t^2+150t$

where:

h = height (in metres)
t = time (in seconds)

Method 1

Rewrite the equation in vertex form by completing the square:

$h=-5t^2+150t$

$\implies h=-5t^2+150t-1125+1125$

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The vertex (15, 1125) is the turning point of the parabola (minimum or maximum point). As the leading coefficient of the given equation is negative, the parabola opens downward, and so vertex is the maximum point. Therefore, the maximum height is the y-value of the vertex: 1125 metres.

Method 2

Differentiate the function:

$\implies \dfrac{dh}{dt}=-10t+150$