# Posts by Sal

Total # Posts: 100

**Chemistry**

How do you create a calibration curve? How do you use a calibration curve to convert absorbance to concentration in mg/mL?

**Mathematics**

Monica stepped outside and began to think how fast she is moving even when she is standing still. Assume that the earth is a sphere with a radius of 3960 miles and Monica is at a latitude of 13∘N. What is Monica's speed due solely to the rotation of the earth in ...

**Social Studies**

The citizens of Rome put the good of the republic ahead of their own desires and the Founding Fathers hoped American people would do the same. Serving in public office without financial gain was important in the success of the country

**Social Studies**

They are just asking for help jeez. I guarantee it that their are times when look on the internet for assistance with answers! Don't worry I will give help Hello out when I get the answer.

**physics**

can someone else me solve this equation? E=mgh

**Math**

If apples are 25 cent's, watermelon is 4 dollars, and cantaloupe is 50 cents . what 25 fruits can I buy with 25 dollars ??

**calculus 1**

the average temperature in Hartford can be expressed as t = f(m) where m is month (January = 1, etc.) and t is the average daily high temperature for the month in degrees F. 1) what is the meaning of f'(m)? rate of change of the average temperature (in degrees F) as the ...

**Math**

Please help. Julio uses a scale of 1/ 8 inch 1 foot when he paints landscapes. In one painting, a giant sequoia tree is 34.375 inches tall. How tall is the real tree?

**Math**

Find the solution or solutions of the equation: 3^x=3/2x+6 Thank You ;)

**algebra**

Write an expression in simplest form that represents the perimeter of the polygon. the measure of the sides are 3x, x + 10, 2x + 2, and 5x. Would the simplified expression be 11x + 12?

**Algebra**

I had this question too, just chose whatever is close to being right, which is 2.

**Algebra**

There's no typos or no other possible answers...

**Math**

Please check my answer for this: 17 - 4 x 3 + 8 = The answer I come to is 13

**2ND GRADE MATH**

I have 3 coins, They total less than 25 cents. I cannot make 15 cents. I can make 6 cents. What are my coins.

**Health**

THANK YOU SO MUCH KATIE

**L.A**

bab

**Art**

1. D? 2. B?

**Art**

1. Which movie professional creates the storyboard? A. Screenwriter B. Production designer C. Director D. Graphic artist 2. How might a cinematographer create a believable scene in natures? A. Through research of plants and animals B. Through adjustment of props C. Through ...

**math**

the waiting time for a roller coaster is 20 minutes if 150 people are in line how long will you wait if 240 people are in line

**probability**

For each 100 8th grade girls in a certain middle school, 85 play soccer, 70 have a cell phone, 75 have a tablet computer, and 80 play a musical instrument. What is the least possible number of these 100 girls who play soccer, have a cell phone, own a tablet computer, and play ...

**Language arts**

Which of the following events is part of the novels falling action? A. Paul reveres ride to Lexington B. Johnnys injury of his hand and need to find another trade C. Johnnys acceptance of Dr. Warrens offer to operate on his hand D. General gage and the soldiers arrival in ...

**Trigonometry**

Graph the following functions .include two full periods .a)y=3cos(2x) and b)y=-4sin(4x) on same graph

**Organic Chemistry**

I have a Lab assignment that requires the synthesis of carboxylic acid and our final product is Benzoic Acid. The following equation was provided: C7H8 + KMnO4 ---> MnO2 1) KMnO4, OH-, heat 2) H3O+ We were asked to balance the equation including the by-products. I was able ...

**trig**

if (-12,5) is a pointon the terminal side of an angel 0 find the exact value of six trig funcation of 0

**chemistry**

Convert pressures from mmHg to atm then use combined gas law to solve for the new volume. You get 2.06 Liters

**algebra**

solve 1/3(2x-5)=3

**physics**

A 53.0-kg person jumps from rest off a 12.0-m-high tower straight down into the water. Neglect air resistance. She comes to rest 3.00 m under the surface of the water. Determine the magnitude of the average force that the water exerts on the diver. This force is nonconservative

**English**

Signal Phrase: Read "Too Much Pressure" by Colleen Wenke (564-568). Consider it a model for using signal phrases to introduce quoted material as explained on pages 508-512 of the Bedford Handbook. 1. Copy two good examples from Wenke's essay of signal phrases ...

**Math**

$23095.36

**Grammar**

Is "is" an adverb?

**Math**

if a dog is sitting on a porch and 20 meters away a cat is playing. if the dog travels at 4m per second and the cat travels at 2m per second. how many seconds does the cat have before he should be up a tree

**Geometry**

Ah wait i got the equation for BD as y=-2/7 x + 16/7 is that right?

**Geometry**

The gradient/slope for BD is -2/7

**Geometry**

I get the gradient part reiny, but how do you use one of the points to get the equation?

**Geometry**

The points A,B,C,D have coordinates (3,3) (8,0) (-1,1) (-6,4) respectively. Find the coordinates of the point of intersection of the diagonals AC and BD? Help plZ!!!

**Geometry**

Your a star!!!!!!!!!!!!! Many thanks

**Geometry**

Im sorry!!! Its so late and im half asleep. Worse time to do maths. I get it reiny!!!!!!! Thank you So the second point is -4 = -4 therefore it must be the correct equation as both points satisfy the equation?

**Geometry**

What is RS and LS?

**Geometry**

Is there a way of simplifying the equation 4y-3x=-10 to y=0.75x - 2.5, then proving that is the equation for DA?

**Geometry**

Could you please explain that in full, as im really struggling to understand. The other two points were for calculating gradients AB, CB, DC and DA but i got that. Thanks reiny!

**Geometry**

You are given the cordinates of the four points A (6,2), B(2.4), C (-6, -2) and D (-2,-4). Show that the equation of the line DA is 4y-3x = -10 help please!!

**english**

Odysseus sent three men to see what the land [possible capitalization of L here] of the Lotus Eaters, who LIVED on the flower, WAS [watch your tenses] about. The three men had gotten fed the Lotus and now they had no desire to go back to the ship or TO go back home. That is ...

**PHYSICS**

What is the direction (vertical or horizontal) of the transmission axis of Polaroid sunglasses? Give the physical reason for your answer.

**PHYSICS**

What is the direction (vertical or horizontal) of the transmission axis of Polaroid sunglasses? Give the physical reason for your answer.

**chemistry**

Image one is b and Image Two is C

**physics**

to prevent dust and soot particles from polluting the atmosphere, industry often employs static electric charge in their smokestacks. explain the physics principle involved in this application

**Applied Math**

.25

**English Literature**

SOMEONE ANSWER THIS!

**Physics**

3.9x10^7

**calculus**

A car leaves an intersection traveling east. Its position t sec later is given by x = t2 + t ft. At the same time, another car leaves the same intersection heading north, traveling y = t2 + 3t ft in t sec. Find the rate at which the distance between the two cars will be ...

**temperture**

c= 5over9 (f-32)

**spelling**

many rules are loosely enforced.

**geometry**

what is the height of a cone with a volume of 66 cubic centimeters and a base with a radius of 3 centimeters

**math**

168p divided by -14

**math**

-6

**Biology: Ecosystems**

That's ok. I already found the answers. Although I did try that before and it didn't help.

**Biology: Ecosystems**

What are three groups of organisms that are photosynthetic autotrophs? What are the primary producers of the deep-sea vents?

**biology**

Thanks for the help!

**biology**

What are two behaviors in either a plant or animal that demonstrates a circadian rhythm?

**math**

A surveyor has a unit pace of 0.9 m/pace. (a) she counts 37 paces while walking From point C to point D. What is the distance between C to D? (b) how many paces should the same surveyor. count to lay out a line roughly 122m long?

**chem PLEASE HELP**

I am very sorry. Chem is just not my thing and i looked in my notes the book and everything

**chem PLEASE HELP**

WHO MADE THESE ATOMIC DISCOVERIES? An atom has a nucleus that is very small In a reaction, the mass of the products must equal the mass of the reactants. Electrons are negatively charge pieces of matter. An electron has a mass that is very small compared to the size of the ...

**Calculus**

The area of largest isosceles triangle that can be drawn with one vertex at the origin and with others on a line parallel to and above the x-axis and on the curve y=27-x^2 is.... A) 108 B) 27 C) 12 root 3 D) 54 E) 24 root 3

**algebra**

Five socks colored blue, brown, black, red, and purple are in a drawer. How many combinations of three socks can be randomly selected from the drawer?

**algebra**

Solve for n: 5to the second power n + 1= 1/25 express answer as a common fraction.

**AP math 11 grade**

the charges for a phone call are $.52 for first min. and $.35 for each additional min. A)graph this step function for 6 minutes.Let x represent time, and f(x) the charge B) for the domain 0<x<=6, what is the range? C)is the relation formed by interchanging x and f(x) ...

**chemistry**

How many grams of rust form when 453 kJ of energy are released?

**chemistry**

0.000197

**Physics**

When physicians diagnose arterial blockages, they quote the reduction in flow rate. If the flow rate in an artery has been reduced to 30% of its normal value due to plaque formation, and the average pressure difference has increased by 40%, by what factor has the plaque ...

**chemistry**

what is the chemical word equation for neutralizing acid spills? Please help me!!

**calculus**

Consider the following function. f(x) = (x+2)/(x-3) (a) Find f '(x) (b) Find f '(4)

**science**

From the following: pure water solution of C12H22O11 (m=0.01) in water solution of NaCl (m=0.01) in water solution of CaCl2 (m=0.01) in water choose the one with the a) highest freezing point b) lowest freezing point c) highest boiling point d) lowest boiling point e) highest ...

**astronomy**

what does the phenomenon of interference demonstrate? a)the wave nature of light b)the polarization of light waves c)the quantization of the atomic orbitals d) the particle nature of the photon e) the process of ionization -how about for diffraction?

**chemistry**

(0.95 L x 323 K) / 298 K = 1.03 L of Argon gas

**psychology**

what is the difference between absolute continuity and differential continuity in regards to personality traits?

**Chemistry**

Identify each enthalpy change by name and classify each change as exothermic or endothermic. a)1 mol C3H8 (l) ==> 1 mol C3H8 (g) b)1 mol Hg (l) ==> 1 mol Hg (s) c)1 mol NH3 (g) ==> 1 mol NH3 (l) d)1 mol NaCl(s) + 3.88kJ/mol ==> 1 mol NaCl (aq) e)1 mol NaCL (s) ==&...

**Chemistry**

Identify each enthalpy change by name and classify each change as exothermic or endothermic. a)1 mol C3H8 (l) ==> 1 mol C3H8 (g) b)1 mol Hg (l) ==> 1 mol Hg (s) c)1 mol NH3 (g) ==> 1 mol NH3 (l) d)1 mol NaCl(s) + 3.88kJ/mol ==> 1 mol NaCl (aq) e)1 mol NaCL (s) ==&...

**calculus**

find the slope of the tangent line to the curve (sqrt 2x+4y) + (sqrt 4xy) = 9.16 at the point (1,5) dy/dx method implicit differantiation?

**geography**

What are the various problems and difficulties that can occur with a society in the middle of the ocean, or a society under the ocean. (Ex. Waste management, or agriculture) I need about 5. Also, what is the necessary technology needed to make the environment not only liveable...

**physics**

A baseball is thrown with an initial velocity of magnitude v at an angle of 27.2 with respect to the horizontal (x) direction. At the same time, a second ball is thrown with the same initial speed at a different angle with respect to x. If the two balls land at the same spot, ...

**physics**

A helicopter is flying horizontally at 7.5 m/s and an altitude of 17 m when a package of emergency medical supplies is ejected horizontally backward with a speed of 13 m/s relative to the helicopter. Ignoring air resistance, what is the horizontal distance between the package ...

**Physics**

This is a very confusing question and I have no idea how to tackle it. - In a nuclear reactor, neutrons released by nuclear fission must be slowed down before they can trigger additional reactions in other nuclei. To see what sort of material is most effective in slowing (or ...

**Physics**

also sorry to add, the drop off point from slide is 1.5m from ground.

**Physics**

If the height of the water slide in the is = 3.9m , and the person's initial speed at point A is 0.60 m/s , what is the horizontal distance between the base of the slide and the splashdown point of the person?

**Physics**

This question has been blowing my mind, and my teacher is offering no help whatsoever. Experiments performed on the wing of a hawkmoth (Manduca sexta) show that it deflects by a distance of = 4.9 mm when a force of magnitude = 3.2 mN is applied at the tip. A: Treating the wing...

**Science-Physics?**

Still so confused @_@. Does the dimension as length mean, when calculated the answer = length?

**Science-Physics?**

Hi simple question which of these have the dimension as length? A) a*t^2 B) v^2/2*a C) a*v D) (v^2*m)/F

**Physical Science**

Almost all the water vapor in the atmosphere is in the exosphere, ionosphere, stratopause, or troposphere?

**chemistry honors**

yes

**chemistry honors**

a student collects 400 mL of oxygen at 9.80 kPa. if the tempeture remains constant, what volume would this gas occupy at 9.40 kPa

**science**

What does "statistical analysis" mean?? I tried to look at dictinary. com but i didn't get anything that i understood... PLEASE HELP ME!!

**U.S.History**

#1 c #2 b #3 c #4 I'm leaning towards b

**ALGEBRA**

Thank you .. If i had to solve for x what would be my answer if I had to choose from.. Ano solution B{-2,-3} C{2,3} D-2 E3 F0

**ALGEBRA**

Can someone please solve these for me? Thank you. x^2 + 5x + 6 = 0 [SQRT(x + 3)] = 2[SQRT(x)]

**Algrebra**

What would i do with the 2 ?

**Algrebra**

I would appreciate your help with this. Thank you Solve each equation and check for extraneous solutions. [SQRT(x - 3)] - 7=0 2[SQRT(w + 4)]=5 [SQRT(x)]=-2

**math**

John has $2.50 in nickels and dimes in his wallet. He has twice as many dimes as nickels. How many of each coin does he have? Let dimes = _____. Let nickels = _______. Equation:________________

**Chemistry**

for the reaction 2Na(s) + Cl2(g) -> 2NaCl(s), how many grams of NaCl could be produced from 103g of Na and 13L of Cl2 (at STP)

**math**

what is the rule for using diameter to find circumference? If the diameter is 2* the length of the radius then d/2 then C=2pie+r. CATCH YOU ON THE FLIP SIDE

**Chem**

at a pressure of 780mm Hg and 24.2 c,a certian gas has a volume of 350.0 mL .what will the volume of this gas under STP.

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