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1.) (3x – 2y)^2 =

2.) If x > 2, then x^2– x – 6 over x^2 - 4=

3.) 4 – (-6) over -5 =

4.) If 2x – 3(x + 4) = - 5, then x =

5.) – 3(5 – 6) – 4(2 – 3) =

I know, it's elementary algebra and it's bad I can't even solve 'em, I just don't remember how too!
It's not for homework, it's for a placement test. So any help will do. Thank you!

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the first one : 10x-30=15x-40
10=5x
x=2

the other equations are like this.......

Good luck

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Home >All Categories > Science & Mathematics >Astronomy & Space >Open Question I I Member since:April 13, 2011Total points:80 (Level 1)carbon tetrachloride -
arsenic disulfide -
sulfur trioxide -
methane -Answer Question

by Enclosed... Member since:April 02, 2011Total points:778 (Level 2)*note: the numbers in brackets {} are subscripts
carbon tetrachloride - CCl{4}
arsenic disulfide - As{4}S{4}
sulfur trioxide - SO{3}
methane - CH{4}

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You should direct this question to your doctor or pharmacist. Part of the pharmacists (chemists) job when they are prescribing pharmaceuticals is to look at your record to see what else you are taking, and make sure that there are no harmful drug interactions or overdoses.

So please don't take any answer here as definitive, as you should really be asking a health professional. In my opinion though, unless you are going to different doctors and chemists and they don't know what you are taking, then you should be fine if they are doing their job correctly. Also, if the drugs have different active ingredients, you will still be within the therapeutic window for each drug, and overdosing will not be a problem.

I am a nanotechnology engineering student with some theoretical background on pharmaceutical design and manufacturing.

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From the values of ?H and ?S, predict which of the following reactions would be spontaneous at 25°C. If either of the reactions is nonspontaneous at 25°C, at what temperature might it become spontaneous?

(a) reaction A: ?H = 12.1 kJ/mol, ?S = 29 J/K·mol
Is this spontaneous or nonspontaneous? Also, for the reaction what is ?G and T?

(b) reaction B: ?H = 2.0 kJ/mol, ?S = -110. J/K·mol
Is this spontaneous or nonspontaneous? Also, for the reaction what is ?G and T?

Please help and if you can, show me how you did the work. Thanks.

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(88,347,000/3,389,269,000) x 100 = 2.6%

:)>

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QUESTION:
- CMB hot spots have matter density that is about 10^-5 higher than the background average.
Let us consider the evolution of such a hot spot with the opposite assumption as above.
Assume the matter density in the hot spot is sufficient to resist the cosmological expansion and therefore remains constant, while the rest of the universe expands as
a = t^2/3
Compared to today's mean matter density in the universe (30% of the critical density),
how much higher is the matter density in these hot spots today?

it has something to with the density of background = t^-2, and i'm supposed to calculate the ratio based on the times

PLEAAAASEEE HELPPPPP

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what are these pulses that neurons send to each other, and what do these pulses do.

also, what are sensory organs and why are they called them

by this: perceive stimuli originating from outside or inside the body.
does that mean: become aware of an action coming from outside or inside of body

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which of these organisms has the biggest biomass? and which has the smallest?

1 oak tree -> 4000 greenfly -> 100 ladybirds -> 5 robins

also how would you draw the shape of a pyramid of biomass for this food chain ^^

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1.Which of the following barium salts should dissolve in a strong acid such as HCl: Ba(OH)2, BaSO4, or BaCO3? Can you explain why please?

2.The cations Ba 2+ and Sr 2+ can be precipitated as very insoluble sulfates.BaSO4 (Ksp = 1.1x 10-10) SrSO4 (Ksp 3.4 x 10-7)

a) If you add sodium sulfate to a solution containing these metal cations, each with a concentration of 0.10 M, which is precipitated first, BaSO4, or SrSO4?

b) What will be the concentration for the first ion that precipitates when the second, more soluble salt begins to precipitate?

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1. How long should you roast a whole ham that weighs 11 2/3 pounds? Is it.... 2 1/3 hours?
2. At what time should you put the ham in the oven if you want to eat at 5:20 P.M.? Is it ... 3:00 P.M.?

These problems I don't get:
3. How long should you roast a chicken that weighs 3 2/3 pounds?
4. At what time should you put the chicken in the oven if you want to eat at 5:45 P.M.?
5. How long should you roast a pork roast that weighs 3 4/5 pounds?
6. At what time should you put the pork roast in the oven if you want to eat at 6:30 P.M.?

CHART!
Meat--------------------------------Ti… (hour per lb)
Pork Roast-----------------------7/15
Ham--------------------------------1/5
Beef Roast-----------------------1/3
Beef Ribs-------------------------2/5
Chicken---------------------------1 3/4

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14x^3 - 21x

there is a common factor of 7x

7x(2x^2 - 3)

8x^2 - 4x = 4x(2x - 1)

36w^3 - 9w) = 9w(4w^2 - 1) = 9w(2w + 1)(2w - 1)

Check by multiplying.

Read your textbook. Practice. See your teacher---these were very easy !

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I've been out of math for a while but for #1..use the FOIL method.
F=first
O=outside
I=inside
L=last

(a+2)(a+2)
=a(a)+a(2)+2(a)+2(2)
=a2(squared)+2a+2a+4
=a2+4a+4

I hope I helped! Good luck!

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Home >All Categories > Science & Mathematics >Zoology >Open Question Afflicti... Member since:January 04, 2010Total points:1,001 (Level 3)Okay so I live un georgia and I moved here about 2 weeks ago and ive seen these dominatly brown colorded bees with a white strip running horrizontaly in the middle of its body. It looks to be about 1-2 inches long and seems very mean. I never saw them in alabama, only here. Anyways can you tell me what kind of bee/wasp/hornet this is? Oh and by the way it seems to fly and socialize by itself. Never seen them interacting with another bee.

Answer Question

Be the first to answer this question.

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B sodium dumps in very rapidly - and just as quickly the cell employs a sodium pump to pump it all back out again.

Probably the closest thing to magic we'll ever see.

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1) you can subtract 3y from both sides in the first equation to get....

x = 23 - 3y

plug this into the second equation to get...

3 (23 - 3y) - 2y = 3
69 - 9y - 2y = 3
11 y = 66
y = 6

plug this into either equation to find x.

x + 3(6) = 23
x = 5

2) what you are going to substitute will be very easy as the first equation is very straight forward. multiply each side of the first equation to get y = 5x (for easier calculations), then plug it into the second equation to get...

3x + 2(5x) = 26
13 x = 26
x = 2

plug in this value in either equation to find y

2 = y/5
y = 10

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1. Write an equation, in point-slope form, of the line with a slope of 2 and containing the point (5, -2).

A.

y + 2 = 2(x - 5)

B.

y - 2 = 2(x + 5)

C.

y - 5 = 2(x + 2)

2. Find the equation of a vertical line through the point (-1, 6).

A.

x = 6

B.

x = -1

C.

y = 6

D.

y = -1

3. Find the equation of a line through the points (1, 3) and (6, -7). Express the equation in slope-intercept form.

A.

y = 2x + 1

B.

y = -2x + 5

C.

y = -2x + 7

4. Find the equation of the line that is perpendicular to y = 5 that goes through the point (-3, 2).

A.

y = -1

B.

y = 2

C.

x = 5

D.

x = -3

5. Write the equation of the line with a slope of -2 and goes through the point (-1, 6). Express the equation in standard form.

A.

2x + y = -7

B.

2x + y = -11

C.

2x + y = 4

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ADD PHASES TOO, PLEASE!
HI(aq) +Al(s)-->

H2CO3(aq) +LiOH(aq)--->

THANKS !!!

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