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Flura [38]
3 years ago
6

Israel started to solve a radical equation in this way:

Mathematics
2 answers:
stira [4]3 years ago
8 0
I think the correct answer from the choices listed above is option D. The mistake that he did was that he did not check extraneous solutions.

√(-2 + 6 ) - 4 = - 2
√2  - 4 = -2
- 2 = - 2
and: √(- 5 + 6 ) - 4 = - 5
√ 1 - 4 = - 5
- 3 ≠ - 5

Therefore, x = - 5  does not work.
BartSMP [9]3 years ago
4 0
Only x = - 2 works in the original equation. 
√(-2 + 6 ) - 4 = - 2
√2  - 4 = -2
- 2 = - 2
and: √(- 5 + 6 ) - 4 = - 5
√ 1 - 4 = - 5
- 3 ≠ - 5 ( x = - 5  does not work ).
Answer: D ) He did not check for extraneous solutions.
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Suppose a right cylinder was bent into a U-shape and was compared to another right cylinder. What can be said about their volume
xenn [34]

Answer:

The volume of the U-shape will be<u> half </u>the volume of the original  right cylinder.

Step-by-step explanation:

If we are given a right cylinder and it was bent into a U shaped then this U-shaped figure could also be considered as a half cylinder.

We could see from the figure attached how this shape looks like.

and now the volume of this half cylinder will be half the volume of the actual right cylinder.

5 0
4 years ago
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Solve the word problem. Olivia has 21 coins in her drawer. Nine of the coins are nickels, and the rest are pennies. What is the
Maslowich
It will be 57 because if 9 are nickles in the rest are pennies
6 0
3 years ago
A second number is 7 less than the first number. The third number is twice the first number. If the sum of the three numbers is
Mars2501 [29]

Answer:

x=4

Step-by-step explanation:

hope it will help

First no.=x

2nd no.=2x

3rd no. =2x+6

x+2x+2x+6=26

5x+6=26

5×=26-6

5x =20.......divide both sides by 5

x=4

1st no.=x=4

7 0
3 years ago
The formula represents the height in the feet above the the ground at time t of a person who is riding a ferris wheel. What is t
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Step-by-step explanation:

You forgot to include the formula, but it has to be either a sine wave or cosine wave:

h = A sin(ωt + φ) + B

The coefficient A is called the amplitude.  The diameter of the ferris wheel is double the amplitude.

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5 0
3 years ago
A bag contains 150 marbles. Some are blue, and the rest are white. There are 21 blue marbles for every 4 white marbles. How many
Olin [163]

Given:

Total number of marbles in the bag = 150

There are 21 blue marbles for every 4 white marbles.

To find:

The number of blue marbles in the bag.

Solution:

Since, there are 21 blue marbles for every 4 white marbles, therefore the ratio of blue marble to white marbles is 21:4.

Let the number of blue marbles be 21x and white marbles be 4x.

Total number of marbles in the bag = 150

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Divide both sides by 25.

x=\dfrac{150}{25}

x=6

Now,

\text{Blue marbles}=21x

\text{Blue marbles}=21(6)

\text{Blue marbles}=126

Therefore, the number of blue marbles is 126.

8 0
3 years ago
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