sal
Most popular questions and responses by sal
AP Chemistry
Write the formula for each of the following compounds, being sure to use brackets to indicate the coordination sphere. (b) bis(bipyridyl)cadmium(II) chloride (c) potassium tetrabromo(orthophenanthroline) cobaltate(III) (d) cesium
asked on December 29, 2017 
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
asked on March 9, 2015 
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
asked on October 5, 2010 
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
asked on October 19, 2011 
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.
asked on October 22, 2009 
Linear algebra
If →u and →v are the vectors below, find the vector →w whose tail is at the point halfway from the tip of →v to the tip of →v−→u and whose head is at the point halfway from the tip of →u to the tip of →u+→v. Assume all vectors are in
asked on September 22, 2018 
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
asked on January 7, 2015 
linear algebra
Find all values of x so that the triangle with vertices A=(−3, 1, x), B=(−3, 4, −2), and C=(−2, −2, 2) has a right angle at A.
asked on September 26, 2018 
calculus
Find the slope of the tangent line to the curve x^2+y^3=5x^2y+5 at the point (1,−1). Please help!
asked on October 24, 2018 
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?
asked on December 15, 2015 
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.
asked on October 28, 2015 
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
asked on October 30, 2009 
Linear Algebra
Find conditions on k that will make the matrix A invertible. To enter your answer, first select 'always', 'never', or whether k should be equal or not equal to specific values, then enter a value or a list of values separated by commas. A = −2 3 0 2 k 0
asked on October 21, 2018 
psychology
what is the difference between absolute continuity and differential continuity in regards to personality traits?
asked on June 1, 2010 
physics
A 53.0kg person jumps from rest off a 12.0mhigh 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
asked on July 10, 2013 
physics
A child starts from rest and slides down a snowcovered hill with a slope angle of 47° from a height of 1.8m above the bottom of the hill. The speed of the child at the bottom of the hill is 3.1m/s. Find the coefficient of kinetic friction between the
asked on October 27, 2018 
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?
asked on May 9, 2010 
linear algebra
Let A be the matrix below and define a transformation T:ℝ3→ℝ3 by T(U) = AU. For the vector B below, find a vector U such that T maps U to B, if possible. Otherwise state that there is no such U. A = +3+3 −6 +1+3 −8 −3 0 −2 B = +6 0 −9 Not
asked on November 4, 2018 
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)
asked on January 31, 2008 
Language Arts
which of the following sentence parts describes the italicized portion of this sentence? the board walk in atlantic city hugs the white, sandy, coastline
asked on March 7, 2019 
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
asked on May 23, 2010 
Algebra
Given the following vector X, find a nonzero square matrix A such that AX=0: You can resize a matrix (when appropriate) by clicking and dragging the bottomright corner of the matrix. X= 2 8 6 A= _ _ _ _ _ _ _ _ _ Please help, I do not understand this..
asked on October 13, 2018 
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
asked on October 24, 2016 
linear algebra
If →u and →v are the vectors below, find the vector →w whose tail is at the point halfway from the tip of →v to the tip of →u and whose head is at the point halfway from the tip of →u to the tip of →u−→v. Assume all vectors are in
asked on September 21, 2018 
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 xaxis and on the curve y=27x^2 is.... A) 108 B) 27 C) 12 root 3 D) 54 E) 24 root 3
asked on March 8, 2011 
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
asked on November 6, 2010 
physics
You swing a 1.40m long string with a metal ball attached to its end in a vertical circle, such that the speed of the ball does not change but the rope is always taut. The tension in the string when the ball is at the bottom of the circle is 64.0N more than
asked on November 15, 2018 
physics
A curious child finds a rope hanging vertically from the ceiling of a large storage hangar. The child grabs the rope and starts running in a circle. The length of the rope is 13.0m. When the child runs in a circle of radius 7.0m, the child is about to lose
asked on October 15, 2018 
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
asked on May 23, 2010 
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?
asked on September 12, 2010 
calculus
Let f be a continuous function on [−3,3], and suppose 7 is the absolute maximum value of f on [−3,3]. Using properties of integrals, this tells us that ∫3,−3 f(x)dx≤−−−. What number goes in the blank? please help..
asked on November 30, 2018 
linear algebra
The reduced rowechelon form of the augmented matrix for a system of linear equations with variables x1, ... , x5 is given below. Determine the solutions for the system and enter them below. 1 0 0 3 3 = 4 0 1 0 2 5 =1 0 0 0 0 0 = 0 If the system has
asked on October 7, 2018 
chemistry
How many grams of rust form when 453 kJ of energy are released?
asked on November 15, 2010 
Stats
Suppose a random sample of size 58 is selected from a population with σ = 9. Find the value of the standard error of the mean in each of the following cases (use the finite population correction factor if appropriate). A) The population size is infinite
asked on November 21, 2019 
calculus
If F(x)+C is the general antiderivative of f(x), then what is the general antiderivative of f(x)+3 ?
asked on November 24, 2018 
geography
which event had the greatest impact on the culture of south america
asked on October 22, 2019 
calculus
You are making a rectangle from two horizontal rods and two vertical rods. Horizontal rods cost $3 per foot and vertical rods cost $5 per foot. If your budget is $180, then what area is the largest possible area of the rectangle? Not sure how to start it
asked on November 14, 2018 
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
asked on May 14, 2009 
linear algebra
If A, B, and C are 3×3 matrices; and det(A) = −3, det(B) = −2, and det(C) = −1 then compute: det(2A^−1C^−1A^TC^2B^2) = 0
asked on October 27, 2018 
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
asked on February 8, 2016 
math
1. Use special right triangles to state the value of the 6 trig functions for 30 degrees, 45 degrees and 60 degrees. 2. Use the calculator to evaluate the value of the following trig functions. sec 54^o 23’ cot 35^o 21’ 45’’
asked on October 4, 2019 
physics
A 13.0kg block slides 5.00m down a frictionless surface inclined 31.0° above the horizontal, before being stopped by an originally unstretched spring of spring constant k=346N/m secured to the inclined surface. Find the maximum compression of the spring.
asked on October 27, 2018 
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?
asked on July 4, 2011 
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
asked on January 29, 2010 
Linear Algebra
Consider the following system of linear equations: 2x1+2x2+4x3 = −12 x1+6x2−8x3 = −6 x1−2x2+9x3 = −8 Let A be the coefficient matrix and X the solution matrix to the system. Solve the system by first computing A−1 and then using it to find X. I
asked on October 20, 2018 
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:________________
asked on November 11, 2008 
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
asked on January 14, 2015 
English
Signal Phrase: Read "Too Much Pressure" by Colleen Wenke (564568). Consider it a model for using signal phrases to introduce quoted material as explained on pages 508512 of the Bedford Handbook. 1. Copy two good examples from Wenke's essay of signal
asked on July 3, 2013 
chemistry
what is the chemical word equation for neutralizing acid spills? Please help me!!
asked on November 3, 2010 
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
asked on January 30, 2010 
geometry
what is the height of a cone with a volume of 66 cubic centimeters and a base with a radius of 3 centimeters
asked on October 17, 2011 
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!!
asked on March 25, 2009 
calculus
Take the second derivative of 2sin2(x) and evaluate it at x=π/3. So I got the second derivative, 8sin(2x) How do I solve plug in x=π/3 and solve? Do I use the special triangle?
asked on October 24, 2018 
algebra
Solve the following system of linear equations: 2x2+4x3+2x4 = −5 5x2+10x3+5x4 = −15 x1+2x2+2x3−3x4 =3 If the system has no solution, demonstrate this by giving a rowechelon form of the augmented matrix for the system.
asked on October 7, 2018 
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
asked on February 5, 2013 
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
asked on October 20, 2012 
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
asked on December 31, 2008 
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
asked on January 10, 2015 
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
asked on April 14, 2011 
calculus
Consider the following function. f(x) = (x+2)/(x3) (a) Find f '(x) (b) Find f '(4)
asked on October 27, 2010 
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?
asked on October 22, 2009 
Physical Science
Almost all the water vapor in the atmosphere is in the exosphere, ionosphere, stratopause, or troposphere?
asked on June 2, 2009 
Science bio Please help!!
Pretend you are a medical professional and it your job to make an I.V. solution for a patient that has a total cellular solute count of 1.19%. What would be the perfect I.V. solution to administer to your patient?
asked on October 6, 2017 
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 ??
asked on August 20, 2016 
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
asked on November 7, 2014 
PHYSICS
What is the direction (vertical or horizontal) of the transmission axis of Polaroid sunglasses? Give the physical reason for your answer.
asked on November 25, 2012 
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
asked on November 26, 2006 
calculus
Find limx→∞ e^−x = 1/e So would the answer be 0?
asked on October 17, 2018 
linear algebra
If →u and →v are the vectors below, find the vector →w whose tail is at the point halfway from the tip of →v to the tip of →v−→u and whose head is at the point halfway from the tip of →u to the tip of →u+→v. Assume all vectors are in
asked on September 22, 2018 
calculus
Let t be an angle between π and 3π/2, and suppose sec(t)=−2.6. What is tan(t)? Having a hard time with this one..
asked on September 19, 2018 
science
What are 5 dinosaurs that lived in Georgia
asked on September 12, 2018 
Chemistry
How do you create a calibration curve? How do you use a calibration curve to convert absorbance to concentration in mg/mL?
asked on November 7, 2016 
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?
asked on February 6, 2016 
Trigonometry
Graph the following functions .include two full periods .a)y=3cos(2x) and b)y=4sin(4x) on same graph
asked on December 9, 2014 
algebra
solve 1/3(2x5)=3
asked on October 11, 2013 
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!!!
asked on January 30, 2013 
biology
What are two behaviors in either a plant or animal that demonstrates a circadian rhythm?
asked on August 12, 2011 
algebra
Solve for n: 5to the second power n + 1= 1/25 express answer as a common fraction.
asked on January 30, 2011 
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
asked on April 5, 2010 
ALGEBRA
Can someone please solve these for me? Thank you. x^2 + 5x + 6 = 0 [SQRT(x + 3)] = 2[SQRT(x)]
asked on January 5, 2009 
calculus
Define a function f(x)= {(x^29)/(x3), if x≠3, {c, if x=3 What value of c makes f continuous at x=3? Is the answer 1?
asked on October 17, 2018 
calculus
Let g(x)=(3x+x^2)(2+e^(x−1)). Find g′(1) So I found the derivative (2x+3)(e^(x−1)+2)+(x^2+3x)e^(x−1) I tried plugging in 1 but I'm getting a different answer..
asked on October 17, 2018 
trig
if (12,5) is a pointon the terminal side of an angel 0 find the exact value of six trig funcation of 0
asked on June 19, 2014 
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 4y3x = 10 help please!!
asked on January 30, 2013 
PHYSICS
What is the direction (vertical or horizontal) of the transmission axis of Polaroid sunglasses? Give the physical reason for your answer.
asked on November 25, 2012 
Biology: Ecosystems
What are three groups of organisms that are photosynthetic autotrophs? What are the primary producers of the deepsea vents?
asked on August 25, 2011 
SciencePhysics?
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
asked on October 18, 2009 
physics
can someone else me solve this equation? E=mgh
asked on September 12, 2016 
math
168p divided by 14
asked on October 12, 2011 
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?
asked on February 8, 2011 
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
asked on November 21, 2010 
linear algebra
Find the point 4/5 of the way from (7, −10, −4) to (7, 0, 10). Not sure where to go about with this. I'm assuming I find the distance from the two points first..
asked on September 22, 2018 
Math
Find the solution or solutions of the equation: 3^x=3/2x+6 Thank You ;)
asked on February 3, 2016 
Math
Please check my answer for this: 17  4 x 3 + 8 = The answer I come to is 13
asked on November 2, 2015 
Grammar
Is "is" an adverb?
asked on February 8, 2013 
temperture
c= 5over9 (f32)
asked on October 17, 2011

Science
idk help me
posted on December 3, 2019 
Finance
not sure
posted on March 21, 2019 
Language Arts
idk
posted on March 7, 2019