Friday
November 28, 2014

Posts by rachel


Total # Posts: 1,238

math
A test had 200 questions .Each correct answer carried 2 marks.Each wrong answer carried -1/2 marks and unanswered question fetched no marks .Ajay attempted all the question in the test and he scored 360 marks.What would his marks be, if for each correct answer he got 1/2 marks...
November 28, 2014

AP CALC. AB
1. Let f be the function given by f(x)=x^2+4x-8. The tangent line to the graph at x = 2 is used to approximate values of f . For what value(s) of x is the tangent line approximation twice that of f ? I: -√2 II: 1 III: √2 Select one: a. III only b. I and III only c...
November 26, 2014

Algebra
What is the range of the function f(x)=3-2*51^x? Give your answer as an interval.
November 21, 2014

Math
Hi Reiny, Thank you for answering my question, but I dont think there is ã2 at the top because, my teacher said it is just supposed to be whole numbers in the denominator and numerator.
November 21, 2014

Math
No problem.
November 20, 2014

Math
10 divided by 4/5 is the same thing as multiplying it's reciprocal. 10 * 5/4 = 50/4 (All you have to do is flip 4/5 to 5/4) You can simplify 50/4 to 12 1/2.
November 20, 2014

Science
What would happen if cells didn't have the following? : -Nucleus -Ribosomes -Endoplasmic Reticulum -Cell Wall
November 20, 2014

Algebra
A kite is tied to the ground. The rays from the sun hit the kite perpendicular to the kite string, casting a shadow of the kite on the ground. The coordinates in the diagram are given in feet. What is the distance from where the kite is tied to the shadow? Coordinates are (3,...
November 19, 2014

Statistic
A major airline company is concerned that its proportion of late arrivals has substantially increased in the past month. Historical data shows that 18% of the company airplanes have arrived late. In a random sample of 1,240 airplanes, 310 airplanes have arrived late. a. ...
November 17, 2014

Cal-help-Plz?
Me confuseddd
November 16, 2014

Cal
Which of the following functions is continuous but not differentiable at x = 1? Functions: I.y=3√x-1 II.y={x^2,x≤1 2x,x>1 III. y={x,x≤1 1/x,x>1 I'm not really sure how to do this, but I've been trying and I keep getting both I and III.. am I ...
November 16, 2014

CAL
Okay I sure will! Thanks
November 16, 2014

CAL-Reinyyy
The equation is y= x cubed over x minus x so; y= x^3 / x -x Sorry for being confusingg
November 16, 2014

AP CALC. AB
A particle moves along a line so that at time t, where 0<=t<=pi, its position is given by s(t)= -4cost-((t^2)/2)+10 What is the velocity of the particle when its acceleration is zero? a. 8.13 b. 1.32 c. 0.74 d. -5.19 e. 2.55 I know that c and b are incorrect Please help me
November 16, 2014

Algebra
I don't understand
November 14, 2014

Algebra
What is the equation in the slope intercept form for the line that passes through the points (1,-3) and (3,1)? Y=3x+1 Y=x-3 Y=2x+5 Y=2x-5
November 14, 2014

Algebra
What is an equation in slope intercept form for the line that passes through the points (1,-3) and (3,1)?
November 13, 2014

AP CALC. AB
I am really confused on part 1. I don't even know what u did. For part 2 where did u get .75 and did you mean to solve for dh/dt
November 7, 2014

AP CALC. AB
Please help me with this problem and please walk me through each step i am really confused. Sand is falling from a rectangular box container whose base measures 40 inches by 20 inches at a constant rate of 300 cubic inches per minute. a) how is the depth of the sand in the box...
November 7, 2014

AP Calc. AB
If f(x)=2x+sin(x) and the function g is the inverse of f, then g'(2)=?? a. 0.40 b. 0.38 c. 0.34 d. 0.32 e. 0.36
November 1, 2014

Finance
The 6 percent, semi-annual bonds issued by Black Water Mills mature in 9 years and have a face value of $2,200. What is the current value of one of these bonds if the market rate of return is 11.10 percent?
October 29, 2014

Chemistry
do you know anyone who can help me with those questions if you do can you please let them know thanks
October 27, 2014

Chemistry
the one that says science rachel
October 27, 2014

Chemistry
did you write anything because it doesnt show
October 27, 2014

science
drbob222 can you please answer the science questions on my post
October 27, 2014

science
do you know anyone who can help me?
October 27, 2014

science
dr bob 222 or ms.sue can you please answer these questions
October 27, 2014

math
which number has the greatest value? a 3.5 b square root of 15** c square root of 1/16 d 26/100 which number is an irrational number? a 3.5 b square root of 36 c square root of 48 d 37/100*** If a is a rational number and b is an irrational number, then the sum a + b is A)...
October 27, 2014

science
1. Tommy performed an experiment to test the solubility of sodium chloride in water. After he completed his experiment, he discovered that he had a few unused grams of NaCl leftover in a beaker. What should he do with the excess NaCl? A. Pour the excess back into the original ...
October 27, 2014

AP Calc. AB
If f and g are functions such that f(g(x))=g(f(x))=x for all x in their domains, and if f(a)=b and f'(a)=c, then g'(b) =? a) g'(a)=1/c b) g'(b)=1/c c) g'(b)=-1/c d) g'(b)=1/a e) g'(a)=-1/c
October 26, 2014

Chemistry
3NO2(g) + H2O(l) → 2HNO3(aq) + NO(g) standard enthalpy: -133.5 Find the change in internal energy for this reaction. Enter in kJ.
October 21, 2014

Statistics
Suppose a certain species bird has an average weight of grams. Based on previous studies, we can assume that the weights of these birds have a normal distribution with grams. For a small group of 13 birds, find the margin of error for a 70% confidence interval for the average ...
October 19, 2014

US History
This is a letter from George Washington to Patrick Henry: September 24, 1787 I dont understand what his purpose and point of view is. Please help me!!! Dear Sir: In the first moment after my return I take the liberty of sending you a copy of the Constitution which the Foederal...
October 19, 2014

AP CALC. AB
1.The position of a particle moving on the line y = 2 is given by x(t)= 2t^3-13t^2+22t-5 where t is time in seconds. When is the particle at rest? a. t =0.268, 2.500, and 3.732 b. t = 0, 1.153, and 3.180 c. t = 1.153, 2.167 and 3.180 d. t = 2.167 e. t = 1.153 and 3.180 2.A ...
October 12, 2014

physics
A cyclist maintains a constant velocity of 4.1 m/s headed away from point A. At some initial time, the cyclist is 244 m from point A. What will be his displacement from his starting position after 60 s?
October 10, 2014

Economics
explain why positive and negative externalities are market failures
October 9, 2014

US History
The Revolutionary War could be considered an international war. Explain if this statement is true or false using examples.
October 7, 2014

US History
Were the colonists politically independent before the French and Indian War?
October 6, 2014

US History
the seven years of war led to taxation without representation because of the debt that king george had to pay for. therefore this angered the colonies and was a turning point to english and colonists relationships
October 5, 2014

US History
i am writing an essay so i need to write about multiple reasons
October 5, 2014

US History
taxation without represent ions that the only one that i know
October 5, 2014

US History
Why was seven years of war a turning point in British colonial society and their relationship with England? Please give me 4 different reasons.
October 5, 2014

physics
A diver achieves a horizontal velocity of 3.76 m/s from a diving platform located 6m above the water. How far from the edge will the diver be when she hits the water?
October 5, 2014

AP CALC. AB
Let f(x)=3/x. If the rate of change of f at x = c is three times its rate of change at x = 2, then c = ?
October 3, 2014

AP Calc. AB
At how many points on the curve y=4x^5-3x^4+15x^2+6 will the line tangent to the curve pass through the origin?
October 3, 2014

AP Calc. AB
1.If an arrow is shot upward on the moon with a velocity of 50 m/s its height (in meters) after t seconds is given by H = 50t - 0.66t2. With what velocity will the arrow hit the moon? a. -49.5 b. -47 c. -50.1 d. -50 e. -51 2.If an arrow is shot upward on the moon with a ...
September 28, 2014

math statistics
A group of teenager smoking rate dropped 8.5% in 2007 from 17.6% in 2001 and 23% in 1997. 1. Calculate the probability that at least one in a group of 10 teenagers smoked in 2007.2. Calculate the probability that at least one in a group of 10 teenagers smoked in 2001. 1. ...
September 23, 2014

statistics
Teenage smoking rate dropped to 8.5% in 2007 from 17.6% in 2001 and 23% in 1997. 1. Calculate the probability that at least one in a group of 10 teenagers smoked in 2007. 2. Calculate the probability that at least one in a group of 10 teenagers smoked in 2001. 3. Calculate the...
September 23, 2014

AP Calc. AB
is it 57 m/s??
September 21, 2014

AP Calc. AB
If an arrow is shot upward on the moon with a velocity of 57 m/s its height (in meters) after t seconds is given by H= 57t-0.06t^2. With what velocity will the arrow hit the moon?
September 21, 2014

AP Calc. AB
Thanks Steve ur a life saver!!
September 21, 2014

AP Calc. AB
1.Which function is NOT continuous everywhere? A.y=(4x)/(x+1)^2 B.y=|x| C.y=(x)/(x^2+1) D.y=√(x^2+1) E.y=x^(2/3) 2.State the domain f(x)= √((x+6)) sinx 3. Let h(x) {(sin2x)/x, if x ≠ 0 {a, if x=0 find the value of a so that hi s continuousat x=0 a. it is sot ...
September 21, 2014

US History
What factors made New England so different from the middle and southern colonies? Consider such things as economics, environment, social make up, philosophy, and religion?
September 21, 2014

US History
Thank You!!!
September 17, 2014

US History
Why is the landing at Plymouth Rock seen as just as important as Jamestown, or more so, in the founding of our country?
September 17, 2014

English
Would just in this sentence be considered and adverb? Now when they were first made, the bears were covered with hair and had sharp claws. Would this be an example of adverb modifying a verb
September 14, 2014

algebra
Find the center and radius of the circle whose equation is 5x^2−6x+5y^2+8y−9=0.
September 14, 2014

algebra
Find the domain and range of: F(x)=sqrt(x)+16
September 14, 2014

English
What is the tone in When Grizzlies Walked Upright?
September 14, 2014

Biology
Is respiratory control more sensitive to small changes in arterial PO2 or in arterial PCO2?
September 8, 2014

Biology - very urgent
Is respiratory control more sensitive to small changes in arterial PO2 or in arterial PCO2?
September 8, 2014

Marketing
How would you classify Wal-Mart in terms of its position on the wheel of retailing versus that of an off-price retailer?
September 7, 2014

Math
At Lucy's Restaurant,1 3/4 a serving of tomato soup is cups. Lucy makes 63 cups of tomato soup each day. How many servings of tomato soup does she make?
August 26, 2014

Chemistry
Calculate the concentrations of all species in a 1.17 M Na2SO3 (sodium sulfite) solution. The ionization constants for sulfurous acid are Ka1 = 1.4× 10–2 and Ka2 = 6.3× 10–8. I found Na+ = 2.34 SO3^2- = 1.17 H2SO3 = 7.14 x10^-13 I can't find HSO3...
July 21, 2014

Chemistry
Phosphoric acid, H3PO4(aq), is a triprotic acid, meaning that one molecule of the acid has three acidic protons. Estimate the pH, and the concentrations of all species in a 0.200 M phosphoric acid solution. pKa1 = 2.16 pKa2 = 7.21 pKa3 = 12.32 Ok I haven't been able to ...
July 21, 2014

analytic geometry
the three vertices of a triangle are at A (-4,5), B(-5,3) and C (3,-4), show that the line joining the midpoint of the sides AC and BC is parallel and equal to one-half of AB . solve
July 16, 2014

analytic geometry
the three vertices of a triangle are at A (-4,5), B(-5,3) and C (3,-4), show that the line joining the midpoint of the sides AC and BC is parallel and equal to one-half of AB . solve
July 16, 2014

science
A comet is in an elliptical orbit around the Sun. Its closest approach to the Sun is a distance of 4.8 x10^10 m (inside the orbit of Mercury), at which point its speed is 9.1 x10^4 m/s. Its farthest distance from the Sun is far beyond the orbit of Pluto. What is its speed when...
July 8, 2014

math
what is the integral from 2 to 1 of 15sqrt(4x^2-3) dx
July 2, 2014

science
A 25 kg box is being pushed across the floor by a constant force ‹ 100, 0, 0 › N. The coefficient of kinetic friction for the table and box is 0.15. At t = 6.0 s the box is at location ‹ 14, 3, −4 › m, traveling with velocity ‹ 6, 0, 0 › m/s...
June 30, 2014

Chemistry
Fish breathe the dissolved air in water through their gills. Assuming the partial pressures of oxygen and nitrogen in the air are to be .20 atm and .80 atm respectively, calculate the mole fractions of oxygen and nitrogen in the air dissolved in water at 298 k. The ...
May 31, 2014

geometry
Ralph the monkey is looking down at a 31° angle from the top of a tree. There are bananas on the ground 12.4 ft from the base of the tree. If Ralph flies down from the tree at a diagonal path, shown in the diagram by x, what distance would he travel? Round to the nearest ...
May 29, 2014

maths
calculate the values of p and q Analytical geometry
May 18, 2014

physics
A moving object has a kinetic energy of 147 J and a momentum of 22.3 kg·m/s. a) Find the speed of the object. Answer in units of m/s
May 1, 2014

Chemistry
A small pebble is heated and placed in a foam cup calorimeter containing water at 25 °C. The water reaches a maximum temperature of 27 °C. If the pebble released 532.1 J of heat to the water, what mass (in g) of water was in the calorimeter? can you show me what ...
May 1, 2014

Chemistry
A small pebble is heated and placed in a foam cup calorimeter containing water at 25 °C. The water reaches a maximum temperature of 27 °C. If the pebble released 532.1 J of heat to the water, what mass (in g) of water was in the calorimeter?
April 30, 2014

Chemistry
If 82.4 g of cold water (initially at 22 °C) is mixed in an insulated container with 96 g of hot water (initially at 88 °C), what will be the final temperature of the water in °C?
April 30, 2014

Calculus
if the work required to stretch a spring 1 ft beyond its natural length is 12 ft-b, how much work is needed to stretch 9 inches beyond its natural length?
April 30, 2014

Math
A ball is thrown downward from the top of a 100-foot building with an initial velocity of 14 feet per second. The height of the ball h after t seconds is given by the equation h=-16t^2-14t+100. How long after the ball is thrown will it strike the ground?
April 28, 2014

Algebra
How can I solve 1/2x+1/x=-12?
April 16, 2014

physics
A weight oscillates in a vertical motion according to the position function y(t)=-5cos t. Assuming t>=0 (greater than or equal to), when will the acceleration of the weight be zero for the first time?
March 27, 2014

math
Thomas bought a 3-foot sandwich for his .Hew figured out that each guest can have 1 1/2 inches of the sandwich . HOW MANY guest does Thomas have.
March 24, 2014

Consumer Math
I am purchasing a house for $235,000 and have excellent credit. If I pay $1,678.93 at the end of the first month, how much is applied to the principal balance?
March 3, 2014

Science
One gram of platinum has 3.09 × 1021 atoms, and each platinum atom has 78 electrons. How many electrons are contained in 4.00 g of platinum? The elemental charge is 1.6 × 10−19 C. Answer in units of electrons
February 26, 2014

Algebra II
Suppose that the profit, p, for selling bumper stickers is given by p(x) = 0.1x2 + 8x - 50. What is the minimum number of bumper stickers that must be sold to make a profit? a. 6 c. 10 b. 2 d. 15
February 25, 2014

Math
sally bakes two cakes, a square and a circle. the length of the side of the square cakes is 8 inches. find the perimeter of the cake (the cake is in the shape of hearth )
February 22, 2014

Physics
1. Two points in a plane have polar coordinates (2.5 m, 30 degrees) and (3.8 m, 120 deg). Determine (a) the cartesian coordinates of both points and (b) the distance between the points. 2. Vector A has magnitude 29 units and points along +y. When vector B is added to the ...
February 17, 2014

Math
3 similar shirts and 4 similar jackets cost $360. 1 such shirt and 3 such jackets cost $220. Find the cost of each shirt.
February 16, 2014

Calculus
Line l is tangent to the graph of y= x - x²/500 at point Q & it crosses the y-axis at (0, 20) a). Find the x-coordinate of point Q b. Write an equation for line l c) Suppose the graph of y=x-x^2/500, where x and y are measured in feet, represents a hill. There is a 50-...
February 15, 2014

chem
How do I calculate the rate of a reaction of a substance using the slope of the lines and stoichiometry of the reactions in moles/sec. I also know that the molarity of that substance.
February 13, 2014

Calculus
The position of a function of a moving particle is s(t)=5+4t-t^2 for 0<t<10 where s is in meters and t is measured in seconds. What is the maximum speed in m/sec of the particle on the interval [0,10]?
February 13, 2014

Calculus
Let f be the function defined by f(x)=x^3 + x. If g(x)= the inverse of f(x), and g(2)=1, what is the value of g'(2)?
February 13, 2014

math
Find the altitude of an isosceles triangle whose base is 8 cm and whose legs are 5 cm?
February 13, 2014

chemistry
Three part question Two students each measured the density of a quartz sample three times: Student A Student B 1. 3.20g/mL 2.82g/mL 2. 2.58g/mL 2.48g/mL 3. 2.10g/mL 2.59g/mL mean 2.63g/mL 2.63 g/mL a. which student measured density with the greatest precision? explain your ...
February 11, 2014

chemistry
The directions state "weigh about 5 grams of sodium chloride". Give minimum and maximum amounts of sodium chloride that would satisfy these instructions.
February 11, 2014

Physics
A car is speeding up in the forward direction on a level road. a. The frictional force acting from the road on the tires is pointed forward. b. The frictional force acting from the road on the tires is pointed backward. c. There is not enough information to determine the ...
February 3, 2014

Spanish
Tienes
January 31, 2014

Calculus
Thank you!
January 31, 2014

Calculus
Let f be the function given by f(x)= 2x/(sqrt(x^2 +x +1)) c. Write an equation for each horizontal asymptote of the graph of f. d. Find the range of f. Use f'(x) to justify your answer.
January 31, 2014

Math
Jody deposited $65 into her savings account. The next day, she withdrew $24. how much of her deposit remains in the account?
January 30, 2014

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