# Posts by Rachel

Total # Posts: 1,537

**AP CALC**

Write a definite integral in terms of x that represents the volume of a sphere with radius 2.

**AP CALC**

Thanks!!

**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 ...

**math**

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

**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...

**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)

**chemistry**

w=500 q=291 dE = 791

**MATH**

animal is. Of those, 1/3 of the people said they like dogs best. How can you finx out how many people liked dogs best

**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...

**math**

32, k 3 , are three consecutive arithmetic terms find k

**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...

**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 $...

**immaculate college**

FindA if (2sinA\2)squared=2

**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?

**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 ...

**life orienttion**

Identify six symptoms of interpersonal conflict in a person

**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.

**Chem 111**

How many grams of N2(g) would have to react to produce 19.5 kJ of energy

**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

**math**

5~15~45~135

**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 ...

**AP CALC**

Thank you!

**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

**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...

**Math**

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

**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?

**aalgebra**

identify the solutions to x+2y=4 9x-4y=3

**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

**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!!

**Poetry**

well i think the theme is words are powerful. they can cause fears or vice versa. but i don't know how ryhme scheme helps build the theme

**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...

**Science**

D.

**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

**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 ...

**Math (Statistics)**

What causes experimental probability to match theoretical probability?

**Deductive reasoning help**

Can someone explain the difference between deductive reasoning and inductive reasoning to me?

**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

**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.

**Chemistry**

Write a balanced equation Solid phosphorus (P) combusts with oxygen gas to form solid tetraphosphorus heptaoxide.

**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

**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 ...

**Calculus- Damon ship builder??**

Ohhhh okay thanks so much.. your a ship builder??? that's pretty awesome. That's a very interesting job :)

**Calculus- Can you help me solve for dr/dt**

What?

**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...

**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?

**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!!

**English**

To what extent to schools need more structure and discipline? Any opinions??

**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?

**AP CaLC. AB**

if you fold it it will create a right triangle. x is the base and y is the height.

**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?

**English**

Opinions please??

**English**

How much control should students have over their education?

**English**

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

**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.

**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?

**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.

**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

**chemistry**

A metal oxide will form an acid when it is dissolved in water. T/F

**chemistry**

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

**Chemistry**

Temperature is a measure of the amount of heat an object contains. T/F

**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...

**math**

I don't know

**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...

**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...

**Algebra**

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

**Math**

Hi Reiny, Thank you for answering my question, but I don't think there is ã2 at the top because, my teacher said it is just supposed to be whole numbers in the denominator and numerator.

**Math**

No problem.

**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.

**Science**

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

**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,...

**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. ...

**Cal-help-Plz?**

Me confuseddd

**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 ...

**CAL**

Okay I sure will! Thanks

**CAL-Reinyyy**

The equation is y= x cubed over x minus x so; y= x^3 / x -x Sorry for being confusingg

**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

**Algebra**

I don't understand

**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

**Algebra**

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

**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

**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...

**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

**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?

**Chemistry**

do you know anyone who can help me with those questions if you do can you please let them know thanks

**Chemistry**

the one that says science rachel

**Chemistry**

did you write anything because it doesnt show

**science**

drbob222 can you please answer the science questions on my post

**science**

do you know anyone who can help me?

**science**

dr bob 222 or ms.sue can you please answer these questions

**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)...

**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 ...

**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

**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.

**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 ...

**US History**

This is a letter from George Washington to Patrick Henry: September 24, 1787 I don't 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 ...

**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 ...

**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?

**Economics**

explain why positive and negative externalities are market failures

**US History**

The Revolutionary War could be considered an international war. Explain if this statement is true or false using examples.

**US History**

Were the colonists politically independent before the French and Indian War?