Thursday

February 23, 2017
Total # Posts: 105,508

**math**

Zack orders a box of 80 sweaters manufactured from a factory. He needs to check the quality of 30% of the sweaters. Select all of the equations that Zack could use to find x, the number of sweaters he needs to check.

*December 16, 2016*

**Really Need Help Please**

Given probabilities: P(A) = 1/200 = 0.005 P(B) = 199/200 = 0.995 P(B|A) = 0.9 P(B|~A) = 0.1 Infer: P(~B|A) = 0.1 P(~B|~A) = 0.9 Then: a.) Find P(A|B) P(A|B) = P(A)P(B|A) = 0.005×0.9 = 0.0045 rounds to 0.0 b.) Find P(~A|~B) P(~A|~B) = P(~A)P(~B|~A) = 0.995×0.9 = 0....

*December 16, 2016*

**Really Need Help Please**

A certain virus infects one in every 200 people. A test used to detect the virus in a person is positive 90% of the time if the person has the virus and 10% of the time if the person does not have the virus. (This 10% result is called a false positive.) Let A be the event &...

*December 16, 2016*

**American Government**

What would be the main benefit of a contested convention be to the other political party? A. a lack of momentum and unity in the contested candidate's party**** B. an inexperienced candidate taking the nomination C. a candidate the public disapproved of taking the ...

*December 16, 2016*

**Health**

The answer is D. for #1 A. for #2 A. for #3 And idk da rest

*December 16, 2016*

**Math - Coordinate Geometry**

Area = 24?

*December 16, 2016*

**Math - Coordinate Geometry**

@MathMate would love that, thanks.

*December 16, 2016*

**Math - Coordinate Geometry**

The vertices of a quadrilateral are A(-2,3), B(5,4), C(4, -3) and D(-3, -4). Prove that ABCD is a rhombus. Find the area of ABCD. Please show working out, thanks.

*December 16, 2016*

**Math - Coordinate Geometry**

Find the equation of the line which passes through the point (6, -4) and is parallel to to the line 2x-3y+3=0. Please show working out as well, thanks.

*December 16, 2016*

**Check Work**

A poll was taken of 10,439 working adults aged 40-70 to determine their level of education. The participants were classified by sex and by level of education. The results are shown below. Education Level Male Female Total High School or Less 2023 3264 5287 Bachelor's ...

*December 16, 2016*

**Math**

Binomial distribution if mean 10 AND VARIANCE 9 find mide

*December 16, 2016*

**compute the probability that a person who tests po**

A certain disease has an incidence rate of 0.3%. If the false negative rate is 6% and the false positive rate is 2%, compute the probability that a person who tests positive actually has the disease.

*December 16, 2016*

**Gauss-Jordan elimination**

Write the system of equations as an augmented matrix. Then solve for x and y. -3x+3y=-21 3x+2y=-4

*December 15, 2016*

**augmented matrix**

Write the system of equations as an augmented matrix. Then solve for x and y. 3x+y=-11 -9x-3y=33

*December 15, 2016*

**Sets**

Suppose Set B contains 69 elements and the total number elements in either Set A or Set B is 107. If the Sets A and B have 13 elements in common, how many elements are contained in set A?

*December 15, 2016*

**Algebra**

Can you please help with this question: The cheerleaders are having a bake sale to raise funds for new uniforms. The group sell cupcakes for $3 each and make a profit of $840 from the sales. If X represents the number of cupcakes the cheerleaders sold and their cooking ...

*December 15, 2016*

**Check Answer!!**

Compute the probability that a person who tests positive actually has the disease. A certain disease has an incidence rate of 0.3%. If the false negative rate is 4% and the false positive rate is 1%, compute the probability that a person who tests positive actually has the ...

*December 15, 2016*

**Math**

Emily has 5u game cards. John has 8/3 fewer cards than Emily. Find the average number of game cards that Emily and John have in all in terms of u.

*December 15, 2016*

**Math**

So do you round $60.89

*December 15, 2016*

**MATH**

Freddy paid w dollars for a camera and $120 for an additional camera lens. If the sales tax is 8%, how much did Freddy pay for the camera and lens, including the sales tax?

*December 15, 2016*

**math**

Emily has 5u game cards. John has 8/13 fewer game cards than Emily. Find the average number of game cards that Emily and John have in all in terms of u.

*December 15, 2016*

**math algebriac expressions**

Okay if it 2 tablespoons equal to fluid ounce how would you write it? yes i will tell my teacher tmorrow

*December 15, 2016*

**math algebriac expressions**

Please help this is wat the problem say

*December 15, 2016*

**math algebriac expressions**

If 6 tablespoons are equivalent to 1 fluid ounce, how many fluid ounces are in (10t-4) tablespoons?

*December 15, 2016*

**Chemistry**

A cube of solid reactant with sides of 1.00 cm² is submerged in a liquid and reacts to form a gas product at an initial rate of 20 mL/s. The solid-liquid interface is 6.0cm² of surface area. If you sliced this cube (like a block of cheese) into 10 slices, and then ...

*December 15, 2016*

**Science**

What do bone marrow and epidermis have in common. A.they are both sites of new cell information B.they both contain structures that assist the body in cooling down if overheating occurs. C.they both contain or are associated with sensory neorons D.they are both involved in ...

*December 15, 2016*

**history**

1. C 2. C 3. C and A 4. D 5. A 6. B 7. C 8. B 9. B 10. B 11. D

*December 15, 2016*

**Calculus**

Determine the open intervals on which the graph of f(x) = -7x^2 + 8x + 1 is concave downward or concave upward. The second derivative is just -14, so I don't know what to do with that.

*December 15, 2016*

**social studies**

ok thank you :)

*December 15, 2016*

**Math**

Bob is twice as old as chuck, and susie is 10 years younger than bob. If the sum of their age is 100 years, how old is susie?

*December 15, 2016*

**Maths**

The diagonals of a rhombus are in the ratio 3:4. If its perimeter is 40 cm, find the lengths of the sides and diagonals of the rhombus

*December 15, 2016*

**history**

What are the comparisons between herodotus and thucydides

*December 15, 2016*

**Math**

109 miles at 1.99 a gallon how much is amount of paid mileage

*December 15, 2016*

**math**

11 notebooks were added to w notebooks. 7 friends then shared the notebooks equally. Express the number of notebooks each person received in terms of w.

*December 14, 2016*

**Math**

The length of a picture frame is (8u - 12) inches. Its width is 3/4 of its length. Express the width of the picture frame in terms of u.

*December 14, 2016*

**math**

determine the equation of the graph in the form y=acos(bx)

*December 14, 2016*

**The Value of an Annuity**

you would like to have $800,000 when you retire in 35 years. How much should you invest each quarter if you can earn a rate of 6.7% compounded quarterly? a) How much should you deposit each quarter? b) How much total money will you put into the account? c) How much total ...

*December 14, 2016*

**math**

How would you justify the steepness of a slope?

*December 14, 2016*

**can you check my answers precalculus**

can you check my answers? Find Pk + 1 if Pk = 7 + 13 + 19 + ...+[6(k - 1)+1] + (6k + 1) 7 + 13 + 19 + …+[6(k - 1) + 1] + (6k + 1) + [6(k + 1) + 1] 8 + 14 + 20 + …+[7(k - 1) + 1] + (7k + 1) 7 + 13 + 19 + …+(6k + 1) 7 + 13 + 19 + ...+[6(k - 1) + 1] + (6k7 +1) + (...

*December 14, 2016*

**precalculus**

can you check my answers? Find Pk + 1 if Pk = 7 + 13 + 19 + ...+[6(k - 1)+1] + (6k + 1) 7 + 13 + 19 + …+[6(k - 1) + 1] + (6k + 1) + [6(k + 1) + 1] 8 + 14 + 20 + …+[7(k - 1) + 1] + (7k + 1) 7 + 13 + 19 + …+(6k + 1) 7 + 13 + 19 + ...+[6(k - 1) + 1] + (6k7 +1) + (...

*December 14, 2016*

**math**

The number of blocks has 9 in the ones place the number in the hundred place is one more than the number in the tens place those two numbers equal 11 how many blocks are there?

*December 14, 2016*

**Science**

How much you would weigh on the moon if you are 72 pounds on Earth

*December 14, 2016*

**math**

Jenn practiced basketball for 45% of the time Kaylee practiced. Jenn practiced for 36 minutes. How long did Kaylee practice?

*December 14, 2016*

**language arts**

ur guys r weird

*December 14, 2016*

**precalculus**

can you check my answers? Find the second difference for the sequence. 7, 6, 7, 10, 15, 22, …. answer: 1 Find first differences for the sequence in order from a1 to a5. Determine whether or not the series is quadratic or not. -1, -3, -1, 5, 15 answer: -2, 2, 6, 10; ...

*December 14, 2016*

**precalculus**

Can you please check my answers? 1.Find Pk + 1 if Pk=2^K-1/k! answer: 2^k+1/(k+1)! 2.Find Pk + 1 if Pk = 7 + 13 + 19 + ...+[6(k - 1)+1] + (6k + 1) answer: 7+13+9...(6k-1+1)+6k+1 +(6k+2) 3.What is the first step when writing a proof using mathematical induction? answer: Find ...

*December 14, 2016*

**Geometry**

I don't know solve it yourself

*December 14, 2016*

**Geometry**

IDK

*December 14, 2016*

**Math**

How much would you need to deposit in an account each month in order to have $20,000 in the account in 7 years? Assume the account earns 2% interest.

*December 14, 2016*

**Finite Math**

You deposit $300 each month into an account earning 8% interest compounded monthly. a) How much will you have in the account in 35 years? b) How much total money will you put into the account? c) How much total interest will you earn?

*December 14, 2016*

**chemistry**

density of sand =3.00g/cm3?

*December 14, 2016*

**math**

Jon adds the expressions 5p + 2 and 2p + 1. Carlos adds the expressions 4p + 3 and 7p + 2.

*December 14, 2016*

**precalculus**

can you check my work? Solve the system of equations at the right by the method of substitution. Verify your results by using a graphing utility. x^2+y^2-4x+6y-5=0, x+y+5=0 x=-y-5 (-y-5)^2+y^2-4(-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...

*December 14, 2016*

**precalculus**

which equation do I graph?

*December 14, 2016*

**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*