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3 years ago

5

Which of the following is a difference of perfect square?

1 answer:

Talja [164]3 years ago

5 0

I think b. is the answer

but i am not sure..

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1 Ms. Omar runs the school tennis club. She has a bin of tennis balls and rackets.

fenix001 [56]

Answer:

Step-by-step explanation:

3 6 9 12 15

5 .

10 .

15 .

20 .

25 .

6 0

3 years ago

Mr.Wells tells his class of 24 that when they have compleyed the assignment they may play online math games.At the end of class,

Tanzania [10]

Answer:

14

Step-by-step explanation:

Because 40% of the class is playing games, that means (100-40)% aren't playing, meaning that those 60% haven't finished the assignment.

We find 60% of the total 24 students, and that is .6 * 24 = 14.4

Because you can't have .4 people, the answer rounds (down ) to 14

5 0

4 years ago

Read 2 more answers

Use a factor tree to write factors of 20

WINSTONCH [101]

The factors of 20 are 1, 2, 4, 5, 10, and 20

7 0

3 years ago

Read 2 more answers

Daniel [21]

Answer:

$x=\sqrt{\frac{7(4+\sqrt{15})}{2}}$

Step-by-step explanation:

From the way it is written, the $x$ is outside the square root. I will rewrite it as:

$x\sqrt{5} =x\sqrt{3} +\sqrt{7}$

$x\sqrt{5}-x\sqrt{3}=\sqrt{7}$

$x(\sqrt{5} - \sqrt{3} )=\sqrt{7}$

$x= \frac{\sqrt{7} }{\sqrt{5} - \sqrt{3}} \implies \frac{\sqrt{7}(\sqrt{5} + \sqrt{3}) }{2}$

$x=\frac{1}{2} \sqrt{7} (\sqrt{5} + \sqrt{3} )$

$x=\frac{\sqrt{35}}{2} +\frac{ \sqrt{21}}{2}$

$x=\frac{\sqrt{35}+\sqrt{21}}{2}$

Multiply denominator and numerator by 3

$x=\frac{3\sqrt{35}+3 \sqrt{21}}{6}$

Factor $\sqrt{3}$

$\sqrt{3} (\sqrt{105}+3 \sqrt{7})$

$x=\frac{\sqrt{3} (\sqrt{105}+3 \sqrt{7})}{6}$

Divide denominator and numerator by $\sqrt{3}$

$x=\frac{\sqrt{105}+3 \sqrt{7}}{2\sqrt{3} }$

Let's rewrite it again

$x=\frac{\sqrt{ (\sqrt{105}+3 \sqrt{7})^2}}{\sqrt{12} }$

$x=\sqrt{ \frac{1}{12} \cdot (\sqrt{105}+3 \sqrt{7})^2}$

It is already in the form $\sqrt{\frac{a}{b} }$

Expanding the perfect square, we have

$63+42\sqrt{15}+105$

$\frac{63}{12} +\frac{42\sqrt{15}}{12} +\frac{105}{12}$

$\frac{21}{4} +\frac{7\sqrt{15}}{2} +\frac{35}{4}$

Factor $\frac{7}{2}$

$\frac{7}{2} (4+\sqrt{15} )$

Therefore,

$x=\sqrt{\frac{7}{2} \left(4+\sqrt{15} \right)}$

$x=\sqrt{\frac{7(4+\sqrt{15})}{2}}$

7 0

3 years ago

Read 2 more answers

Please help me on 9 & 10 ! Will give you brainliest

vlabodo [156]

9. The decrease in population for Lakeside 5,500.

You can find this by taking the new amount and subtracting the original amount. This will give you the net change.

new - old = net change

45,800 - 51,300 = net change

-5,500 = net change

10. The percent increase for Riverview is +51%.

You can find that by looking at the formula for percent change.

$\frac{new - old}{old}$

$\frac{63000 - 41700}{41700}$

$\frac{21300}{41700}$

51%

5 0

3 years ago