3 years ago

PLEASEEE HELP FASTTT!!!! It’s my last question on a 50 question test!!!

Mathematics

1 answer:

mel-nik [20]3 years ago

4 0

Answer:

Step-by-step explanation:

Judging by the fact that this EXACT question already exists on Brainly and it appears to have been a multiple choice test, the answer is C on everyone's response.

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Answer:

I'm not sure sorry

Step-by-step explanation:

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A bag contains 2 red ping pong balls and 3 green ping pong balls and 3 blue ping pong ball and 1 yellow pig pong ball find the p

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What is 3 to the square root of 1089

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3 to square root of 1089 is

5.5590606e+15

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2 years ago

A waterfall has a height of 900 feet. A pebble is thrown upward from the top of the falls with an initial velocity of 24 feet pe

aliya0001 [1]

Answer:

The pebble will hit the ground 8.29 second after it is thrown.

Step-by-step explanation:

Given that,

The height of the pebble after t seconds is given by the equation

h= -16t²+24 t+900.

When the pebble hit the ground, the height of the pebble will be zero.

So putting h=0 in the given equation.

0 = -16t²+24 t+900

⇒-4(4t²-6t-225)=0

⇒4t²-6t-225=0

Applying quadratic formula $t=\frac{-b\pm\sqrt{b^2-4ac}}{2a}$ , here a=4, b= -6 and c= -225.

$\therefore t=\frac{-(-6)\pm\sqrt{(-6)^2-4.4.(-225)}}{2.4}$

⇒ t = 8.29, -6.79

Since time can not negative.

∴t=8.29 seconds.

The pebble will hit the ground 8.29 second after it is thrown.

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3 years ago