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3 years ago

what must you do to undo a square root in order to solve an equation that includes a radical expression

Mathematics

1 answer:

Harman [31]3 years ago

3 0

You would want to find the square root of the number and then multiply that number 3 times to find the cube root.

Example:

$\sqrt{4}$ = 2; $2^{3}$ = 8 ( so ∛8 = 2)

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At a telethon, a volunteer can take 48 calls over a 4-hour shift. At this rate, how many calls can 12 volunteers take in a 4-hou

stellarik [79]

1 volunteer - 4 h - 48 calls
12 volunteers - 4 h - x calls

The time is the same, so it's irrelevant.
1 volunteer - 48 calls
12 volunteers - x calls

x=12*48=576

So it's 576 hours.

5 0

4 years ago

Amy has four more 20c coins than 5c coins. The total value of all her 20c and 5c is $3.80. How many 5c coins does Amy have?

skelet666 [1.2K]

Answer:

Amy has 12 5¢ coins

Step-by-step explanation:

Let x represent 20¢ coins and y represent 5¢ coins.

Amy has four more 20¢ coins than 5¢ coins. Hence:

$x=y+4$

And the total value of all her coins is $3.80. Thus:

$0.2x+0.05y=3.8$

This yields a system of equations:

$\displaystyle \begin{cases} x=y+4 \\ 0.2x+0.05y=3.8\end{cases}$

We can solve by substitution. Substitute the first equation into the first:

$\displaystyle 0.2(y+4)+0.05y=3.8$

Distribute:

$\displaystyle 0.2y+0.8+0.05y=3.8$

Combine like terms:

$\displaystyle 0.25y = 3$

And divide both sides by 0.25. Hence:

$y=12$

Thus, Amy has 12 5¢ coins.

Using the first equation:

$x=y+4$

Substitute:

$x=(12)+4=16$

Thus, Amy has 16 20¢ coins.

In conclusion, Amy has 12 5¢ coins and 16 20¢ coins.

6 0

3 years ago

Find the difference. Write your answer in simplest form. 1 1/6 - 1/2

vodomira [7]

Answer:

2/3

Step-by-step explanation:

1 1/6 - 1/2

Get a common denominator of 6

1 1/6 - 1/2*3/3

1 1/6 - 3/6

Borrow 1 from the 1 in the form of 6/6

6/6 + 1/6 - 3/6

7/6 - 3/6

4/6

Reduce by dividing the top and bottom by 2

2/3

8 0

3 years ago

Read 2 more answers

Help Me, Will give 100 points.

Damm [24]

Answer:

The total monthly cost would be $214

Step-by-step explanation:

This is rather simple. They gave us 1,250, which is half of 2,500. Simple multiplication:

1,250 = 2,500

107 = x

2 × 1,250 = 2,500

2 × 107 = 214

Therefore, the total monthly cost if the cell phone is used for 2,500 minutes is $214.

4 0

3 years ago

Read 2 more answers

Subtract and reduce

juin [17]

Your equation is the following:
11 7/7 - (-8 3/7)
the first step to solving this is to know that when there is a "-" sign in front of the parenthesis, you need to change the sign of each term in the parenthesis.
11 7/7 + 8 3/7
now, add the whole numbers and the fractional parts of the mixed numbers separately.
(11 + 8) + ( $\frac{7}{7} + \frac{3}{7}$ )
add the whole numbers together
19 + ( $\frac{7}{7} + \frac{3}{7}$ )
now add the fractions together
19 + 10/7
next, convert the improper fraction to a mixed number
19 + 1 3/7
now, you will write the mixed number as a sum of the whole number and its fractional part.
19 + 1 + 3/7
add the numbers together
20 + 3/7
finally, write the sum of the whole number and the fraction as a mixed number
20 $\frac{3}{7}$
let me know if you have any further questions
:)

8 0

3 years ago