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Flura [38]
3 years ago
10

A ball is thrown in the air from the top of a building. Its height, in meters above ground, as a function of time, in seconds, i

s given by h(t)=−4.9t2+21t+6. How long does it take to reach maximum height?
Mathematics
1 answer:
sergey [27]3 years ago
4 0

Answer:

we have to find the derivate of that function which is: -4.9*2t +21 and to find the maximum height this derivate should be equal to 0

-9.8t+21=0 so

t=21/9.8=2.14

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Vesnalui [34]

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Step-by-step explanation:

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The distance between Reeta's house and her office is 14 km. She covers 10 km 65 m by scooter, 3 km 75 m by bus and the rest on f
Alexandra [31]

Answer:

She covered <u>0.86 km</u> or <u>860m</u> by walking.

Step-by-step explanation:

Given:

➮ Distance between Reeta's house and her office is 14km.

  • She covers 10km 65m by Scooter.
  • Then, 3km 75m by Bus.
  • And rest of distance covered by foot.

To Find:

➮ How much distance covered by foot/walking ?

Solution:

To find the distance covered by foot = Total distance - Sum of distance covered through scooter and bus.

Sum of distance covered through scooter and bus:-

As, we know:

• 1km = 1000m

⇒ 10km = 10×1000

= <u>10000m</u>

⇒ 3km = 3×1000

= <u>3000m</u>

So, 10000m + 65m ➝ <u>10065m</u>

3000 + 75m ➝ <u>3075m</u>

➝ 10065m + 3075m

➝ 13140m

• 13140m into km:-

⇒ <u>1</u><u>3</u><u>.</u><u>1</u><u>4</u><u>k</u><u>m</u>

Now, Finding the distance covered by walking:

➝ 14km - 13.14km

➝ 0.86km

Hence, She covered <u>0.86km</u> or <u>860m</u> by walking.

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2 years ago
40 less than _____ is 28
hram777 [196]
That would be 12.

40 - 28 = 12
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