# Posts by ANONYMOUS

Total # Posts: 106,772

**precalculus**

Solve the system of equations at the right by the method of substitution. Verify your results by using a graphing utility. x2+y2-4x+6y-5=0, x+y+5=0 answer: x=-y-5 (-y-5)2+y2-4(-y-5)2+6y-5=0 y=?5-5, y=-5-?5 x+?5-5+5=0 x=-?5 x-5-?5+5=0 x=?5 y=?5-5, y=-5-?5, x=-?5, x=?5 how do i ...

*December 14, 2016*

**science**

I like solution of this equation

*December 14, 2016*

**MATH**

A certain disease has an incidence rate of 0.5%. If the false negative rate is 7% and the false positive rate is 2%, compute the probability that a person who tests positive actually has the disease.

*December 14, 2016*

**precalculus**

how do you sketch the curve represented by x=2+3cos? y=2sin? ?

*December 14, 2016*

**precalculus**

how do you sketch the curve represented by x=(?t2+2) y=t/4?

*December 14, 2016*

**socialsss**

what did the qin emperor build to make china's defence stronger

*December 14, 2016*

**precalculus**

sketch the curve represented by the parametric equations. Then eliminate and write the corresponding rectangular equation whose graph represents the curve. x=(?t2+2) y=t/4

*December 14, 2016*

**precalculus**

Can you check my work? sketch the curve represented by the parametric equations. Then eliminate and write the corresponding rectangular equation whose graph represents the curve. x=2+3cos? y=2sin? answer: cos?=x/5 sin?=y/2 cos^2? + sin^2?=1 (x/5)^2+(y/2)^2=1 (x/5)^2+(y/4)^2=1

*December 14, 2016*

**Math**

It takes 5 people 3 days to put up a fence? How many days would 3 people take?

*December 14, 2016*

**precalculus**

how do you write x=2+3cos? y=2sin? in terms of pi?

*December 14, 2016*

**precalculus**

how do you write x=(?t^2+2) in terms of pi?

*December 14, 2016*

**precalculus**

can you check my work? In exercises 10-12, sketch the curve represented by the parametric equations. Then eliminate and write the corresponding rectangular equation whose graph represents the curve. 10. x=t2-6 y=1/2t-1 answer: t=2y-6= (2y+2)2-6 =4y2+8y-2

*December 14, 2016*

**precalculus**

How do you sketch the curve reprsented by the parametric equations : x=t2-6 y=1/2t-1?

*December 14, 2016*

**Social Studies**

How did the Americans disagree over the role of federal and state governments before and during the civil war?

*December 14, 2016*

**pure math**

i) Expand (1-(x/2))1/5 ii)State the range of values of x, for which the expansion is valid

*December 14, 2016*

**One step inequalities**

Unknown number decreased by 9 is at most 27

*December 14, 2016*

**precalculus**

sketch the curve represented by the parametric equations. Then eliminate and write the corresponding rectangular equation whose graph represents the curve. x=(?t^2+2) y=t/4

*December 14, 2016*

**precalculus**

Find the polar equation r=8cos3theta, find the maximum value of lrl and any zeros of r. Verify your answers numerically. |cos3?| <= 1 cos3?=0 when 3? is an odd multiple of ?/2 what is the next step to answering the question?

*December 14, 2016*

**Math**

12 dozen (PS, a dozen means 12) would be 12*12=144. so you break 15 of 144 the problem would be 144-15= ? so how much do you have left?

*December 14, 2016*

**Calculus**

The size of a parcel despatched through the post used to be limited by the fact that the sum of its length and girth (perimeter of the cross section) must not exceed 6 feet. What was the volume of the largest parcel of square cross- section which was acceptable for posting? (...

*December 14, 2016*

**maths**

3/4 of a number exceeds it's 1/3 by 15. Find the number

*December 14, 2016*

**physics**

What is mean by 28degree east of north

*December 14, 2016*

**algebra**

why is the alphabet shorter at christmas time

*December 14, 2016*

**Loans**

If you take out an auto loan of $4,500 at 5% interest for 24 months (2 years), what will your monthly payment be? Round your answer to the nearest cent.

*December 14, 2016*

**SHANNON**

Suppose a math class contains 31 students, 14 females (four of whom speak French) and 17 males (two of whom speak French). Compute the probability that a randomly selected student is female, given that the student speaks French.

*December 14, 2016*

**Probability of having disease when test has false**

A certain disease has an incidence rate of 0.5%. If the false negative rate is 7% and the false positive rate is 2%, compute the probability that a person who tests positive actually has the disease.

*December 14, 2016*

**math**

126cm = x + x + 1 + x + 2 126 = 3x + 3 126 – 3 = 3x 123 = 3x 123/3 = 3x/3 41 = x The 3 consecutive sides of a triangle is 41,42 and 43.

*December 14, 2016*

**math**

A basket at a baby shower contains 10 bottles of pink nail polish numbered 1 through 10, and 11 bottles of red nail polish numbered 1 through 11 one is drawn from the basket at random

*December 13, 2016*

**Chemistry**

What group of elements were not on the original periodic table

*December 13, 2016*

**social studies**

oppsss, yeah its A. Sorry for the inconvenience.

*December 13, 2016*

**social studies**

I think John Locke but I'm not sure

*December 13, 2016*

**social studies**

which Enlightenment thinker taught that life is "brutish" and societies need strong rulers? a) Thomas Hobbes. b) John Locke c) Jean-Jacques Rousseau d) Voltaire

*December 13, 2016*

**Chemistry (PLZ HELP)**

Aluminium can be produced by the thermal decomposition of aluminium oxide. What mass of aluminium would be produced from 3.5kg of aluminium oxide?

*December 13, 2016*

**Math**

Orin has driven 150 miles in the past 8 hours write an algebraic expression to show how many miles are in drove each hour

*December 13, 2016*

**Physics**

A force of 1500 N (pull) is applied to a 200-kg crate at an angle of 20 degrees above horizontal. The coefficient of static friction is .65 and the coefficient of kinetic friction is .43. Does the crate move? If so, what is its acceleration?

*December 13, 2016*

**precalculus**

Find the polar equation r=8cos3theta, find the maximum value of lrl and any zeros of r

*December 13, 2016*

**maths**

how do i make w the subject?!? 11-w/4=1-w

*December 13, 2016*

**American Government**

Consider the expressed non-legislative powers related to patents and copyrights. Why did the founding fathers include these ideas in the expressed powers of Congress? How have patents and copyrights contributed to U.S. History an identity?

*December 13, 2016*

**American Government**

How have the war powers evolved since World War II?

*December 13, 2016*

**American Government**

PLEASE HELP URGENT How has the power of congress evolved through the Necessary and Proper Clause? What role did McCulloch v. Maryland play in this evolution?

*December 13, 2016*

**precalculus**

(a)Determine the number of degrees the axis must be rotated to eliminate the xy term of the conic x2+6xy+y2-6=0. tan2? = B/(A-C) how do I answer the question?

*December 13, 2016*

**precalculus**

how many degrees does the axis need to be rotated to eliminate the xy term of the conic x2+6xy+y2-6=0.

*December 13, 2016*

**precalculus**

sketch the curve represented by the parametric equations. Then eliminate and write the corresponding rectangular equation whose graph represents the curve. 10. x=t2-6 y=1/2t-1 how do I use t = 2y+2?

*December 13, 2016*

**precalculus**

sketch the curve represented by the parametric equations. Then eliminate and write the corresponding rectangular equation whose graph represents the curve. 10. x=t2-6 y=1/2t-1

*December 13, 2016*

**precalculus**

Find the polar equation r=8cos3theta, find the maximum value of lrl and any zeros of r. Verify your answers numerically.

*December 13, 2016*

**precalculus**

Can you check my answers? find two sets of parametric equations for the given rectangular equation x+y^2=4 x=-y^2+4 y=-t^2 x=-t^2+4 x=-t^3 y=-t^3+4 Find a polar equation of an ellipse with its focus at the pole an eccentricity of e=1/4 and directrix at y=4. answer: ?(x^2 + y^2...

*December 13, 2016*

**Random question**

Thanks!

*December 13, 2016*

**Random question**

Mrs Sue please?

*December 13, 2016*

**Random question**

So im doing an experiment, putting tums in vinegar, and when i did, the tum fizzed up and bubbled and disentegrated. Would this be endothermic or exothermic. Endothermic right?

*December 13, 2016*

**Science**

A forrestry crane is lifting vertically a 2 tons log with a force F = ( 9 + 2 h) where h is the height. Draw the free body diagram with the forces and use work and energy conservation to determine the speed of the log when it has risen h=6m. Apply kinematics to give the ...

*December 13, 2016*

**precalculus**

How would you describe the graph of the conic x^2-y^2/4=1?

*December 13, 2016*

**math**

elizabeth buys a glass vase during the sale. if the original price was 12 how much does elizabeth pay .

*December 13, 2016*

**pre calculus**

can you check my work? find two sets of parametric equations for the given rectangular equation x+y^2=4 x=-y^2+4 y=-t^2 x=-t^2+4 x=-t^3 y=-t^3+4 Find a polar equation of an ellipse with its focus at the pole an eccentricity of e=1/4 and directrix at y=4. answer: ?(x^2 + y^2...

*December 13, 2016*

**precalculus**

can you check my work? Find a polar equation of a hyperbola with its focus at the pole, an eccentricity of e=5/4 and directrix at y=2. answer: r=ek/1+esintheta r=(5/4*2)/1+5/4sin theta r=5/2(1+(5sintheta)/4)

*December 13, 2016*

**precalculus**

.(a)Determine the number of degrees the axis must be rotated to eliminate the xy term of the conic x2+6xy+y2-6=0. (b)Graph the conic in part a and use a graphing utility to confirm your result.

*December 13, 2016*

**precalculus**

will someone please check my work? find two sets of parametric equations for the given rectangular equation x+y^2=4 x=-y^2+4 y=-t^2 x=-t^2+4 x=-t^3 y=-t^3+4 Find a polar equation of an ellipse with its focus at the pole an eccentricity of e=1/4 and directrix at y=4. answer: ?(...

*December 13, 2016*

**precalculus**

find two sets of parametric equations for the given rectangular equation x+y^2=4 can you check my work? x=-y^2+4 y=-t^2 x=-t^2+4 x=-t^3 y=-t^3+4

*December 13, 2016*

**precalculus**

can you check my work? Find a polar equation of an ellipse with its focus at the pole an eccentricity of e=1/4 and directrix at y=4. answer: ?(x^2 + y^2) / (y - 4) = 1/4 4?(x^2 + y^2) = y - 4 4r = r sin ? - 4 (sin ? - 4) r = 4 r = 4/(sin ? - 4)

*December 13, 2016*

**precalculus**

Find the polar equation r=8cos3theta, find the maximum value of lrl and any zeros of r. Verify your answers numerically.

*December 13, 2016*

**precalculus**

Find a polar equation of a hyperbola with its focus at the pole, an eccentricity of e=5/4 and directrix at y=2.

*December 13, 2016*

**precalculus**

6.Find the standard form of the equation of the hyperbola with vertices (0±3) and asymptotes (y=±3/2x)

*December 13, 2016*

**Math**

1. A box of crackers has a mass of p kilograms. When empty, the box has a mass of 200 grams. What is the total mass of the crackers in 5 such boxes? Express your answer in kilograms. (seems to me like the empty box part of this is there just to throw you off. Isn't the ...

*December 13, 2016*

**Statitu**

Assuming that boys and girls are equally probable find the number of families out of 1600 families each having 5 children, with 3 boys

*December 13, 2016*

**Math**

Susan picked a squash that weighed 8/15 lb. Larry picked a squash that weighed 1/4 as much as susan's squash. How much did larry'squash weigh?

*December 12, 2016*

**precalculus**

Find the standard form of the equation of the hyperbola with vertices (0±3) and asymptotes (y=±3/2x)

*December 12, 2016*

**physics**

bgvfy

*December 12, 2016*

**science**

Calculate the molarity of 500 ml of a solution containing 100 grams of glucose (C6H12O6).

*December 12, 2016*

**math**

is it possible for system of two linear equations to have no solution.

*December 12, 2016*

**precalculus**

Find the standard form of the equation of the hyperbola with vertices (0±3) and asymptotes (y=±3/2x)

*December 12, 2016*

**Algebra**

My teacher told me the answer was no solution but I dont know how she got it

*December 12, 2016*

**Algebra**

I thought you dont distribute with absolute value

*December 12, 2016*

**Algebra**

How is 9|r-2| < -73 no solutions

*December 12, 2016*

**precalculus**

find two sets of parametric equations for the given rectangular equation x+y^2=4

*December 12, 2016*

**precaculus**

Convert the rectangular coordinate (2,-2) to polar form and find two additional representations of this point. Can you check my work and explain how to finish the question? r=?(2)2+(-2)2 r=2?2 tan theta = (-2)/2 theta = -1 polar coordinate= (2?2, -1)

*December 12, 2016*

**Algebra**

|1-4k| is greater than or equal to -11 How is the answer ALl real numbers

*December 12, 2016*

**precalculus**

find two sets of parametric equations for the given rectangular equation. x^2+4y^2-16=0

*December 12, 2016*

**Calculus**

(a) Compute the area of the bounded region enclosed by the curve y = e^x, the line y = 12, and the y-axis. (b) How does this area compare with the value of the integral ? from 1 to 12 of (ln x dx)? Explain your answer. (A picture may be helpful.)

*December 12, 2016*

**precalculus**

Can you check my work? find two sets of parametric equations for the given rectangular equation x+y^2=4 answer: x=-y^2+4 x=-t y=-t^2+4 x=-t^3 y=-t^3+4

*December 12, 2016*

**Business**

Calculation of yield to maturity: Yield to maturity = (C + ((F-P)/n))*2 / ((F+P)/2) F = Face value = $ 1000 C = Semiannual Coupon Payment = Face value * Coupon rate = $1000*3% = $30 P = Price = $875 n = number of semiannual = 10 years *2 = 20 Semiannual Yield to maturity = (...

*December 12, 2016*

**Physics**

A book with a mass of 1350 g is sitting on a desk. The ukf between the book and the desk is .45 and the ukf between the book and the desk is .30. a. how much horizontal force is required to start the book moving across the desk? b. Once it starts moving, what is the ...

*December 12, 2016*

**precalculus**

find two sets of parametric equations for the given rectangular equation x+y^2=4

*December 12, 2016*

**English**

Compare the attitudes of warfare in 'Charge Of The Light Brigade' and 'Bayonet Charge.'

*December 12, 2016*

**precalculus**

.Find the standard form of the equation of the parabola with focus(8,-2) and directrix x=4

*December 12, 2016*

**precalculus**

can you check my work I really do not understand. Find the standard form of the equation of the parabola with focus(8,-2) and directrix x=4. answer= (y+2)^2=-16(x-12/8)

*December 12, 2016*

**precalculus**

Is this right? Convert the polar coordinate (-14, 5pi/3) to rectangular form. Does it mean rectangular coordinates and if so can you check my work? answer: r=-14 theta=5pi/3 x=-14 cos 5pi/3 x=-14(0.5) x=-7 y=rsintheta y=-14 sin 5pi/3 y=-14(-0.866) y=12.124 (-7,12.124)

*December 12, 2016*

**pre calculus**

can you check my work Find two different sets of parametric equations for the given rectangular equation: y=x^2+10 answer: x=t y=t^2+10 x=t^3 y=t^6+10

*December 12, 2016*

**Calculus**

(a) Compute the area of the bounded region enclosed by the curve y = e^x, the line y = 12, and the y-axis. (b) How does this area compare with the value of the integral ?1-12(ln x dx)? Explain your answer. (A picture may be helpful.)

*December 12, 2016*

**precalculus**

graph r = cos 5? + n cos ?, 0 ? ? ? ? For the integers n = -5 to n = 5. I do not understand this question at all. Can you use a similiar example to explain how I would solve this question?

*December 12, 2016*

**precalculus**

for the question graph r = cos 5? + n cos ?, 0 ? ? ? ? For the integers n = -5 to n = 5. Does this mean that -5,-4,-3,-2,-1,0,1,2,3,4, and 5 are all on the same graph? I really do not understand polar graphs any help would be much appreciated.

*December 12, 2016*

**pre calculus**

How would I graph r = cos 5? + n cos ?, 0 ? ? ? ? For the integers n = -5 to n = 5. ?

*December 12, 2016*

**Science**

A 1750 kg van is travelling down a 10 degrees inclined road at a speed of 6 m/s. If the driver brakes suddenly causing the wheels to lock, determine the distance L his tyres will skid on the road. The coefficient of kinetic friction between the wheels and the road is ?k=0.5. (...

*December 12, 2016*

**Physics**

58.28%

*December 12, 2016*

**science**

teri aesi ki tesi

*December 11, 2016*

**science**

A 12m tall tree to be photographs with pin hole camera it is situated 15 m away from camera how far should screen place from pin hole camera to obtain 15m tall image of tree

*December 11, 2016*

**math**

if Mindy has a 20 minute walk to school and she stops for a hotdog that takes 5 minutes to cook how long will it take for her to get to school?

*December 11, 2016*

**physics**

a force of 400 N at an angle of 15 degrees above horizontal is needed to pull a 180 kg trunk across the floor at constant speed. what is the coefficient of kinetic friction between the trunk and the floor

*December 11, 2016*

**Physics**

A force of 400 N at an angle of 15 degrees above the horizontal is needed to pull a 180 kg trunk across the floor at constant speed. What is the coefficient of kinetic friction between the trunk and the floor?

*December 11, 2016*

**Algebra**

The base of a triangle is 3 inches less than twice its height If the area of the triangle is 126 square inches what equation can be used to find h the height of the triangle in inches A. 2h^2-3h+63=0 B.2h^2-3h-63=0 C.2h^2-3h+252=0 D.2h^2-3h-252=0 I think it's D?

*December 11, 2016*