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3 years ago

Review: To simplify an expression, combine like terms by adding or

Mathematics

1 answer:

gavmur [86]3 years ago

4 0

Answer:

10b + 2

Step-by-step explanation:

To simplify this expression. 10b + 7 - 3 - 2 use the sample you demonstrated above to simplify it

10b + 7 -3 -2

combine the like terms

10b + 7 - 5

10b + 2

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Helppp please!

bagirrra123 [75]

He had 160$ when he first started

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3 years ago

How many liters of 60% alcohol solution should be added to 40 liters of a 20% alcohol solution to make a 50% solution?

kolbaska11 [484]

Answer:

120 liters of 60% alcohol solution is needed

Step-by-step explanation:

Let's assume

x liters of 60% alcohol solution is added

so, we get solution as

$=\frac{60}{100}\times x$

$=0.6x$

we are given

40 liters of a 20% alcohol solution is

$=40\times\frac{20}{100}$

$=8$

so, total alcohol solution is

$=8+0.6x$

now, we can find total solutions

total solutions is

$=x+40$

now, it is making 50% solution

so, we get

$\frac{8+0.6x}{x+40} =\frac{50}{100}$

now, we can solve for x

$\left(8+0.6x\right)\cdot \:100=\left(x+40\right)\cdot \:50$

$800+60x=50x+2000$

$10x=1200$

$x=120$

So,

120 liters of 60% alcohol solution is needed

4 0

3 years ago

Round the nearest indicated place.

erik [133]

Answer:

1 0.33

2 3.679

3. 63.44

4 7.468

5 0.9

4 0

3 years ago

Read 2 more answers

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marshall27 [118]

Answer:
__________________________________________________________

Either:

" 90°F < t < 70°F " ;

or:

" 70°F > t > 90°F " .
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6 0

3 years ago

Simplify. Assume x and y are no negative

erica [24]

$7\sqrt{50x^{15}y^{21}}=7\sqrt{25\cdot2x^{14+1}y^{20+1}}=7\sqrt{25}\cdot\sqrt{x^{14}}\cdot\sqrt{y^{20}}\cdot\sqrt{2xy}\\\\=7(5)\sqrt{(x^7)^2}\cdot\sqrt{(y^{10})^2}\cdot\sqrt{2xy}=35x^7y^{10}\sqrt{2xy}\\\\Used:\\\\\sqrt{ab}=\sqrt{a}\cdot\sqrt{b}\\\\\sqrt{a^2}=a\\\\a^n\cdot a^m=a^{nm}\\\\(a^n)^m=a^{nm}$

5 0

3 years ago