Saturday
July 4, 2015

Posts by RAchel


Total # Posts: 1,324

Physics
A model rocket is fired vertically from the ground with a constant acceleration of 44.3 m/s2 for 1.95 s at which time its fuel is exhausted. What is the maximum height (in m) reached by the rocket? Shouldn't this just be d=rt? 44.3(1.95), but I'm not getting the right ...
June 29, 2015

Physics
Olympic diver Matthew Mitcham springs upward from a diving board that is 3.00 m above the water. He enters the water at a 79.0 degree angle with respect to the water surface, at a speed of 9.01 m/s. Determine the magnitude of his initial velocity. Determine the direction of ...
June 19, 2015

Algebra 1
You are planning a rectangular patio with length that is 7 ft less than three times its width. The area of the patio is 120 ft^2. What are the dimensions of the patio? I just need to figure out what equation to write from this. I'm thinking something along the lines of 3x^...
June 13, 2015

chemistry
How would this problem be worked using dimensional analysis? Answer is 1.32g and I can work it (.900/13.6) * 20 = 1.32 But i need it in dimensional analysis and the hint was to first find volume of mercury. How many grams of alcohol with a density of 0.900 g/cm3 will have the ...
May 25, 2015

Honor's Personal Finance
What is the difference between the cost of attending a particular school and the expected family contribution, minus any other financial aid?
May 13, 2015

AP CALC
What property must f satisfy if the local linear approximation of f is always greater than or equal to the function's value for all x in an interval containing the point of tangency?
April 24, 2015

Algebra 1
Which answer choice shows 2x-y=z correctly solved for y? A: y=2x+z B: y=2x-z C:y=-2x+z D: y=-2x-z Here's how I did it: 2x-y=z -y=2x+z y=-2x-z Am I right? I have a feeling I'm not, so I would like some confirmation one way or the other.
April 20, 2015

AP CALC
My work lim f(x) =3 x->0- lim f(x) =b x->0+ 3=b lim f'(x)=-1 x->0- lim f'(x) =a x->0+ a=-1 therefore a+b=2 AM I RIGHT? Please help
April 14, 2015

AP CALC
If f(x)= { e^(-x)+2, for x<0 { ax+b, for x=>0 is differentiable at x=0, then a+b=_____?
April 14, 2015

Algebra 1
A pyrotechnician plans for two fireworks to explode together at the same height in the air. They travel at speeds shown at the right. Firework B is launched 0.25 s before Firework A. How many seconds after Firework B launches will both fireworks explode? Firework A: 220 ft/s ...
April 13, 2015

math
-2h-21+4h<_9
April 13, 2015

beginig algebra
k=-13
April 13, 2015

beginig algebra
what is -3(k-4)=51
April 13, 2015

earth science
What is the most abundant fossil fuel? A:Coal B:Gas C:Wood D:Oil
April 12, 2015

AP CALC
Write a definite integral in terms of x that represents the volume of a sphere with radius 2.
April 8, 2015

AP CALC
Thanks!!
April 6, 2015

AP CALC
At any time t=>0 , in days, the rate of growth of a bacteria population is given by y' = ky, where y is the number of bacteria present and k is a constant. The initial population is 1500 and the population quadrupled during the first two days. By what factor will the ...
April 6, 2015

math
joel runs 7 miles in 60 minutes. at the same rate ,how many miles would he run in 24 minutes
April 6, 2015

AP CALC
1.Suppose the amount of water collected from a mountain spring decreases over the summer at a rate of 1.5% per day. When will the spring's output fall to four-fifths its present level? Select one: a. 61.086 days b. 34.055 days c. 14.876 days d. 3.347 days e. 52.714 days 2...
April 5, 2015

CGCC
What mass of manganese(II) chloride must react with sulfuric acid to release 54.0mL of hydrogen chloride gas at STP? MnCl2(s)+H2SO4(aq)¨MnSO4(aq)+2HCl(g)
April 5, 2015

Spanish
My question is "¿Qué le diste a tu madre o a tu padre en su cumpleaños?" This is my answer, please tell me if I wrote it right. "Para los cumpleaños de mis padres le di a mi padre una taza super hombre y mi madre una pintura enmarcada...
March 22, 2015

math
32, k 3 , are three consecutive arithmetic terms find k
March 19, 2015

AP CALC
1. Let f be a twice-differentiable function such that f (2) = 8 and f (4) = 5. Which of the following must be true for the function f on the interval 2 ≤ x ≤ 4. I. The average value of f is 6.5 II. The average rate of change of f is -1.5 III. The average value of f...
March 15, 2015

Math
Katy just brought a brand-new 2009 Toyota Camry Hybrid FOR $30,000. Her car was traded in for $16,000. What fraction of the purchase price was not covered by the trade-in? 30,000 -16,000 = $14,000.is the amount not covered. Can you tell me what method to use or how to change $...
March 7, 2015

immaculate college
FindA if (2sinA\2)squared=2
March 4, 2015

Physics
A .5 kg football is thrown and reaches a stationary receiver with a speed of 15m/s. The receiver catches the ball and brings it to rest in .2 sec. a) What is the impulse delivered to the ball? b) What is the average force exerted on the receiver?
March 4, 2015

Physics
Starting from rest, a 4-kg block slides 10 m down a frictionless 30 degree incline. Determine the work done on the block by a) The force of gravity b) The normal force c) All of the forces (the net force) on the block d) Find the Kinetic energy of the block at the end of the ...
March 4, 2015

life orienttion
Identify six symptoms of interpersonal conflict in a person
February 27, 2015

Physics
Speed: A block lies on a horizontal frictionless surface. A horizontal force of 100 N is applied to the block, giving rise to an acceleration of 3 m/s2. What is the speed of the block after 10s? I think I would just multiple the two and put it in terms of speed but I am not sure.
February 25, 2015

Chem 111
How many grams of N2(g) would have to react to produce 19.5 kJ of energy
February 23, 2015

Algebra
The fifth term of an arithmetic sequence is 22 and the 15th term is 62. Find the 100th term and the sum of the first 60 terms
February 22, 2015

math
5~15~45~135
February 22, 2015

AP CALC
The function g is given by the formula g(x)= ∫[0,x/2] e^(-t^2)dt. An equation for the tangent line to the graph of g at the point x=1 is a) y-0.461=0.779(x-1) b) y-0.461=0.389(x-1) c) y-0.461=1.558(x-1) d) y-0.461=0.184(x-1) e) y-0.461=0.368(x-1) I took the derivative ...
February 22, 2015

AP CALC
Thank you!
February 21, 2015

AP CALC
1. Area of the region between the graph of y=2x^2-3x and the x -axis from x=-3 to x=1 is a)62/3 b)97/3 c)16/3 d)20/3 e)92/3 I got e but it's incorrect
February 21, 2015

Physics
A 70 kg person is having a tug-of-war. The rope is horizontal and 1.3 m above the ground. This person’s center of mass is 1.0 m from the ground when he is in an upright standing position. If the force his opponent exerts on the rope is 400 N, what angle must the person be...
February 21, 2015

Math
Find the point of intersection on the graphs of 2x+5y=15 and x-3y=6 How do I do this?
February 21, 2015

Chemistry
If 20.2 mL of base are required to neutralize 29.3 mL of the acid, what is the molarity of the nitric acid solution?
February 10, 2015

aalgebra
identify the solutions to x+2y=4 9x-4y=3
February 6, 2015

Math Homework
I'm really confused on how to do this. Can someone show me step by step on how to solve this? The directions say to use the Sum-to-Product formulas to find the exact value of the expression. sin 5pi/4-sin 3pi/4
February 3, 2015

ELA
how do you write a villanelle? also what are some easy topics to write about? this is due tomorrow so i need help quickly!!
February 2, 2015

Poetry
well i think the theme is words are powerful. they can cause fears or vice versa. but i dont know how ryhme scheme helps build the theme
February 2, 2015

Physics
A lobsterman’s buoy is a solid wooden cylinder of radius r and mass M. It is weighted at one end so that it floats upright in calm sea water, having density. A passing shark tugs on the slack rope mooring the buoy to a lobster trap, pulling the buoy down a distance x from...
January 29, 2015

Science
D.
January 29, 2015

Math
Directions: Find the Location on Unit Circle, Period & General Solution for this problem>>>>>>> sin^2x=3cos^2x What I have so far: sin^2x=3cos^2 sin^2x/cos^2=3 tan^2x=3 tanx=+and- sqrt3
January 27, 2015

Physics
A driver in a car traveling at a speed of 55.4 mi/h sees a deer 116 m away on the road. Calculate the minimum constant acceleration that is necessary for the car to stop without hitting the deer (assuming that the deer does not move in the meantime). I simply do not know how ...
January 25, 2015

Deductive reasoning help
Can someone explain the difference between deductive reasoning and inductive reasoning to me?
January 9, 2015

AP Calc. AB
let f be the function given by f(x)=-2e^x^3. F0r what value of x is the slope of the line tangent to the graph of f at (x,f(x)) equal to -6
January 7, 2015

Chemistry
Write a balanced Chem. Eq 1. Chlorine gas will react with aqueous sodium fluoride if 200J of energy is added and manganese is used as a catalyst. 2. Dinitrogen pentaoxide gas decomposes into its elemental parts.
January 6, 2015

Chemistry
Write a balanced equation Solid phosphorus (P) combusts with oxygen gas to form solid tetraphosphorus heptaoxide.
January 6, 2015

AP CaLC. AB
A particle moves along the x-axis with the velocity at time t=>0 given by v(t)=t^2-3 cos(t). If the particle is at the origin when t=0, its position at the time when v=0, x=?? a. 5.276 b. 334.965 c. 15.276 d. 6.682 e. 2.670
January 3, 2015

AP CaLC. AB
1. A fence 8 ft tall runs parallel to a tall building at a distance of 7 ft from the building. What is the length of the shortest ladder that will reach from the ground over the fence to the wall of the building? Round the result to the nearest hundredth. a.21.20 ft b. 22.20 ...
January 2, 2015

Calculus- Damon ship builder??
Ohhhh okay thanks so much.. your a ship builder??? thats pretty awesome. Thats a very interesting job :)
December 29, 2014

Calculus- Can you help me solve for dr/dt
What?
December 29, 2014

Calculus- Can you help me solve for dr/dt
How fast does the radius of a spherical soap bubble change when you blow air into it at the rate of 15 cubic centimeters per second? Our known rate is dv/dt , the change in volume with respect to time, which is 15 cubic centimeters per second. The rate we want to find is dr/dt...
December 29, 2014

math
The ratio of the monthly incomes of A and B is 3:4. The ratio of monthly expenditures of A and B is 4:5. Which of the below is a possible value of the ratio of their savings? 9:10 3:4 13:20 4:5 How to form a equation for solving this?
December 19, 2014

math
The ratio of the monthly incomes of A and B is 4:3 . The ratio of their monthly expenditures is 5:4 . If A saves one fourth of his monthly income, find the ratio of their monthly savings. Help me solving this please!!
December 19, 2014

English
To what extent to schools need more structure and discipline? Any opinions??
December 14, 2014

Physics
A bowling ball slows down at rate of .12 m/s^2. 5 seconds after it starts down the bowling alley its speed is 15 m/s. What was its initial speed?
December 13, 2014

AP CaLC. AB
if you fold it it will create a right triangle. x is the base and y is the height.
December 13, 2014

AP CaLC. AB
The upper left-hand corner of a piece of paper 8 in. wide by 17 in. long is folded over to the right-hand edge. How would you fold it so as to minimize the length of the fold? In other words, how would you choose x to minimize y?
December 13, 2014

English
Opinions please??
December 10, 2014

English
How much control should students have over their education?
December 10, 2014

English
Amelia was too tired to walk her dog, after running the half marathon. Is that right? And thank you.
December 9, 2014

English
Rewrite the following sentences in order to correct the punctuation. In the morning Shelby ate a peanut butter sandwich and an apple she rode her bike to school. After running the half marathon; Amelia was too tired to walk her dog.
December 9, 2014

math
John and Smith went to a stationery shop. John bought 6 pens, 4 pencils and 3 erasers. Smith bought 3 pens, 8 pencils and 6 erasers and spent 20% more than John. What percentage money did John spend on pens? How can I form an equation and solve?
December 8, 2014

math
The sum of two numbers is 4 and the reciprocal of one exceeds the reciprocal of other by twice the product of their reciprocals. What is the product of the reciprocals of two numbers? Please help me solving.
December 8, 2014

chemistry
The number of protons in an anion must always be ________ the number of electrons. the same as We can’t tell. less than greater than
December 6, 2014

chemistry
A metal oxide will form an acid when it is dissolved in water. T/F
December 6, 2014

chemistry
When an acid and a base react in a neutralization reaction, the products will be acidic. T/F
December 6, 2014

Chemistry
Temperature is a measure of the amount of heat an object contains. T/F
December 6, 2014

Chemistry
An archeological artifact was subjected to radiocarbon dating. The artifact showed a carbon-14 decay rate of 13.8 disintegrations/ min per gram of carbon. Carbon-14 has a half-life of 5715 years, and currently living organisms decay at the rate of 15.3 disintegrations/ min per...
December 5, 2014

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

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