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gayaneshka [121]
3 years ago
6

This is hard question can any wan help me

Mathematics
1 answer:
Mumz [18]3 years ago
5 0

Answer:

8.2secs

Step-by-step explanation:

Given the expression for calculating the height as;

h = -16x^2+127x+80

Given h = 40

Substitute

40 = -16x^2+127x+80

-16x^2+127x+80 - 40 = 0

-16x^2+127x+40 = 0

16x^2-127x-40 = 0

Factorize

x = -(-127)±√(-127)²-4(16)(-40)/2(16)

x = 127±√16,129+2,560/32

x = 127±√18,689/32

x = 127±136.71/32

x = 127+136.71/32

x = 263.71/32

x = 8.24

Hence the required time to the nearest tenth is 8.2secs

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Answer:

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Step-by-step explanation:

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3 years ago
ms. James has a 6 square foot bulletin board and a 12 square food bulletin board. She wants to cover both boards with index card
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Answer:

<em>She need </em><em>72 </em><em>index cards.</em>

Step-by-step explanation:

Ms. James has a 6 square foot bulletin board and a 12 square food bulletin board and she wants to cover both boards with index cards without gaps or overlaps.

Each index card has an area of \dfrac{1}{4} square foot.

Dividing the area of each board with the area of the index card will yield the the number of cards she needs to cover up completely.

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Therefore, in total she need 24+48=72 index cards.

7 0
4 years ago
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Answer:

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Step-by-step explanation:

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