Ask question

Ask question

All categories

3 years ago

10

Please help me with this!!! I will mark brainliest!!

1 answer:

wolverine [178]3 years ago

8 0

Hello from MrBillDoesMath!

Answer:

-9 sqrt(5)

Discussion:

-2 sqrt(20) - sqrt(125) =

-2 *2 sqrt(5) - sqrt(125)= as 20 = 4* 5

-4sqrt(5)- 5 sqrt(5) = as 125 = 25 *5

(-4 -5) sqrt(5) =

-9 sqrt(5)

Thank you,

MrB

You might be interested in

A rectangle has a length of 32 yards less than 3 times its width. If the area of the rectangle is 748 square yards, find the len

Blababa [14]

I hope this helps you

4 0

3 years ago

phaedra would like to buy a blouse costing $27, which is $3 more than 4 times the amount of money she has saved so far. how much

Luda [366]

The answer is 3 because 4x6=24 and add 3 is 27 so she will need 3 dollars.

8 0

3 years ago

Read 2 more answers

Which expression is an irrational number?A. 1/9 <br><br> B.0.4 <br><br> C. √15 <br><br> D. √36

Daniel [21]

C is irrational because there is no definite square root for 15 whereas the square root of 36=6

3 0

4 years ago

Read 2 more answers

Round to the nearest hundredth 42.052

Vera_Pavlovna [14]

42.052

place value and digits:

4 = tens
2 = ones
0 = tenths
5 = hundredths
2 = thousandths

5 is in the hundredths place. To find if you round up or down, look at the digit to the right (thousandths in this case). It is a 2, which is less than 5, so you round down.

42.052 rounded to the nearest hundredth is 42.05

hope this helps

8 0

3 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