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3 years ago

Halp again sorry:<<<<<<

Mathematics

1 answer:

IRINA_888 [86]3 years ago

6 0

Answer:

The one in the middle goes first the one first goes to the middle the last one stays there

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Please help equation below

qaws [65]

Answer:

3y √21 + 2 y√15

Step-by-step explanation:

To simply, we open up the bracket

We have this as;

√(189y^2) + √60y

= 3y √21 + 2 y√15

7 0

2 years ago

A 24.6 g marble sliding to the right at 62.0 cm/s overtakes and collides elastically with a 12.3 g marble moving in the same dir

Softa [21]

Answer:

Velocity of the 24.6 g marble is 31 cm/s.

Step-by-step explanation:

Given:

Marble 1:

Mass of the marble $(m_1)$ = 12.3 gm

Velocity of $m_1$ before collision $v_1_i$ = 15.5 cm/s

Velocity of $m_1$ after collision $v_1_f$ = 77.5 cm/s

Marble 2:

Mass of the marble $(m_2)$ = 24.6 gm

Velocity of $m_2$ before collision $v_2_i$ = 62 cm/s

Velocity of $m_2$ after collision $v_2_f$ = ?

From the law of conservation of momentum, we know that momentum before equals the momentum after :

So,

⇒ $P(i)=P(f)$

⇒ $(m_1\times v_1_i )+(m_2\times v_2_i) =(m_1\times v_1_f)+(m_2\times v_2_f)$

⇒ Plugging the values.

⇒ $(12.3\times 15.5) +(24.6\times 62)=(12.3\times 77.5)+(24.6\times v_2_f)$

⇒ $190.65+1525.2=953.25+24.6\times v_2_f$

⇒ $1715.85=953.25+24.6\times v_2_f$

⇒ $1715.85-953.25=24.6\times v_2_f$ ...subtracting both sides 953.25

⇒ $762.6=24.6\times v_2_f$

⇒ $\frac{762.6}{24.6}\ =v_2_f$ ...dividing both sides with 24.6

⇒ $31=v_2_f$

⇒ $v_2_f =31$ cm/s

The velocity of the 24.6 g marble after the collision is 31 cm/s and it will move opposite to of the 12.3 g marbles that is towards left.

6 0

3 years ago

What are the solutions to the quadratic equation 4x2 + 28x = 0?

AleksandrR [38]

Answer:

x is 0 or -7

Step-by-step explanation:

$4x^{2} +28x=0\\4x(x} +7)=0\\4x=0 x=0\\x+7=0\\x=-7$

6 0

3 years ago

Read 2 more answers

Ann cuts her brownie into six equal parts and eats three pieces. Chris cuts his brownie into ten equal parts and eats four piece

Trava [24]

Answer:

Step-by-step explanation:

Ann ate 3/6, or 1/2 (50%) of hers.

Chris ate 4/10, or 2/5 (40%) of his.

Chris has more left.

5 0

3 years ago

Sawyer bought a t-shirt that cost $13.00. The sales tax rate was 6%. What was the total cost of the t-shirt?

jeka57 [31]

Answer:

13.78

Step-by-step explanation:

[13x(percent as decimal)]+13

(13x0.06)+13

0.78+13

$13.78

Hopes this answers your question and helps

7 0

2 years ago

Halp again sorry:<<<<<<​

Halp again sorry:<<<<<<