Sunday
February 7, 2016

# Posts by Jackie

Total # Posts: 932

Math
state the smallest interval for 5 sin theta to produce a complete graph.
February 27, 2014

Pre-Algebra
Your baseball team has won 6 games and lost 4 games. If the team does not lose any more games, how many games must the team win to have a win: loss ratio of 2:1.
February 24, 2014

Math
does the i mean income?
January 28, 2014

Math
A certain country taxes the first \$20,000 of an individual's income at a rate of 15%, and all income over \$20,000 is taxed at 20%. a. Al makes \$16,000. Betty makes \$36,000. How much is each taxed? b. Write a piecewise function T that specifies the total tax on an income of...
January 28, 2014

english
The plane came down later than expected. In this sentence ,what part of speech is the word down?
January 17, 2014

Algebra
I need help understanding algebra
January 11, 2014

math
Kira walked at a faster rate.😉
January 1, 2014

Math
You're formula Reiny is right, but your numbers are incorrect. You should only use 12 hours not 36 as the patient received the medication at midnight and going to noon is only 12 hours. Therefore the answer is 12.61mg left in the bloodstream.
December 14, 2013

Calculus I don't understand
Find the volume of the solid obtained by rotating the region bounded by the given curves about the specified axis. y = 10 x and y = 5 x^2 about y =0 Find the volume of the solid obtained by rotating the region bounded by y=8 x^2, x = 1, and y = 0 , about the x-axis. I saw some...
December 4, 2013

Math - Algebra 2
THANK YOU! THANK YOU! THANK YOU!!!
December 1, 2013

Math - Algebra 2
I have tried several times to solve this. I have 3 points (0,-5), (3, -6), (-3,-7). I'm trying to get the quadratic equation. I keep getting y=(-1/6)x^2+ (1/6)x +0. When i plug in other numbers to check it's not the parabola facing down like my image. Please help!
December 1, 2013

DE Science
I am thinking A. A scientist claims plants and animals that exhibit reproductive cycles based on the changing seasons are highly affected by climate change. What is the correct justification of the scientist's claims? A) Climate change can cause a timing mismatch of energy...
November 14, 2013

math
The permutataion of 7 the arrangement number of the seven music files would be 7*5*4*3*2*1=
November 14, 2013

algebra
If a Realtor earns ^% commission for selling a \$70,000 home, what is the amount of the commission?
November 12, 2013

algebra
There are two-digit perfect squares whose square roots are the same as their units digits. What is the sum of these squares?
November 12, 2013

Physics
Piston Circle 1 in the figure below has a diameter of 0.29 in.; Piston Circle 2 has a diameter of 1.7 in. In the absence of friction, determine the force vector F necessary to support the 500-lb weight.
November 7, 2013

Math
Value Rent-a-Car rents a luxury car at a daily rate of \$37.01 plus 10 cents a mile. A business person is allotted \$100 for car rental each day. How many miles can the business person travel on the \$100? _______miles
October 28, 2013

Math
A growing number of colleges are teaming up with banks to issue student ID cards that double as debit cards. There were 51 such partnerships in 2003. This number grew to 127 in 2006. What is the percent of increase?
October 28, 2013

Algebra
The formula B=30a is used in New England to estimate the minimum furnace output, B, in BTU's for a modern house with the amount of square feet of flooring, a a. determine the minimum furnace output for a 2000 ft2 modern house b. solve the formula for a What is the minimum ...
October 28, 2013

accounting
using the break-even equations to solve for price and variable cost per unit andromeda company's break-even point is 2,400 units. variable cost per unit is \$42; total costs are 67,200 per year. what price does andromeda charge?
October 25, 2013

physics
(a) One of the moons of Jupiter, named Io, has an orbital radius of 4.22 108 m and a period of 1.77 days. Assuming the orbit is circular, calculate the mass of Jupiter. (b) The largest moon of Jupiter, named Ganymede, has an orbital radius of 1.07 109 m and a period of 7.16 ...
October 22, 2013

PHYSICS
A 3.8-kg bucket of water is raised from a well by a rope. If the upward acceleration of the bucket is 2.1 m/s2, find the force exerted by the rope on the bucket.
September 28, 2013

physics
A novice golfer on the green takes three strokes to sink the ball. The successive displacements of the ball are d1 = 3.98 m to the north, d2 = 2.01 m northeast, and d3 = 1.12 m at 30.0° west of south (see the figure). Starting at the same initial point, an expert golfer ...
September 26, 2013

Physics
A novice golfer on the green takes three strokes to sink the ball. The successive displacements of the ball are d1 = 3.98 m to the north, d2 = 2.01 m northeast, and d3 = 1.12 m at 30.0° west of south (see the figure). Starting at the same initial point, an expert golfer ...
September 25, 2013

Math
I can not remember the rules and how to do the problems Square of 200 ...simplified Square root of 7/16 -simplified
September 18, 2013

Physics
Henry how did you know that the angles were 90, 45 and 240?
September 15, 2013

math
Domain
September 14, 2013

math
f(x)= 1/x^2-8x-9 g(x)= 1/x^2+3x+2
September 14, 2013

Math
ok i get it now. for this question.. 3square root of 1/2x+1 +2=5 the +2=5 is out of the square root. so do i get rid of the square root first or subtract 2 from 5
September 14, 2013

science
Medicine A will reduce the incidence of headaches . what is the independent variable and dependent variable and the two controlled variables?
September 12, 2013

Chemistry
Two elements, R and Q, combine to form two binary compounds. In the first compound, 9.50 g of R combines with 3.00 g of Q. In the second compound, 7.00 g of R combines with 4.50 g of Q. Show that these data are in accord with the law of multiple proportions. If the formula of ...
September 7, 2013

history
HOW DID SPAIN ESTABLISH TERRITORIAL CLAIMS IN THE CARIBBEAN AND SOUTH AMERICA?
August 26, 2013

Math
In Class A there are 80 the Boy to Girl ratio is 3 to 5. In Class B the boy to girl ratio is 3 to 2. If the 2 classes combined have an equal number o fboys and girls how many students are in class B?
August 19, 2013

math
One number is 5 times another. Write an expression for the sum of their reciprocals. Then simplify the expression. (Use x for the variable.)
July 25, 2013

trig
A bird at the top of a tree looks down at a field mouse with an angle of depression of 65 degrees. If the field mouse is 30 meters from the base of the tree, find the distance from which the field mouse to the bird's eyes. Round the answer to the nearest tenth.
July 22, 2013

Physics
A spring with a spring constant of 22N/m is initally compressed by 2.3cm. How much work is required to compress the spring an additional 1.7 cm? I can't find information in my book about compression; only work and exertion. Please help and provide all steps for work. Thank...
June 23, 2013

If the interest rate is 3% and a total of \$4,370.91 will be paid to you at the end of 3 year, what is the present value of that sum.
June 23, 2013

math
Consider the following. (Give your answers correct to four decimal places.) (a) Determine the level of confidence given the confidence coefficient z(á/2) for z(á/2) = 1.65. Incorrect: Your answer is incorrect. . (b) Determine the level of confidence given the ...
June 22, 2013

math help
We have look at this site and it did not help us at all, with it only giving us the a = 0.05, we do not know how to work it out. There has been 4 of us working on this and no one can get it.
June 22, 2013

math help
occurs if you reject the null hypothesis when it I true
June 22, 2013

math help
Sorry if this has been posted twice, but we have tried this numerous times and can not work it. Due in the morning. Suppose that a hypothesis test is to be carried out by using á = 0.05. What is the probability of committing a type I error? (Give your answer correct to ...
June 22, 2013

Math
The image of the public library is constantly changing, and their online services continue to grow. Usage of the library's home page grew by 17% during the past 12 months. It has been estimated that the current average length of a visit to the library's homepage is ...
June 22, 2013

math check
Thank you
June 21, 2013

COP 2000-6
show an example of an user inputs a list of positive numbers terminated by 0 into an array, find the mean of the numbers in the array, and outputs th result. use a subprogram to input the numbers, a function to find the mean, and a subprogram to output the result
June 17, 2013

Algerbra
Write the equation of the circle in standard form. Find the center, radius, intercepts, and graph the circle. x2+y2+16x−18y+145=25 Standard form (x-h)^2 +(y-k)^2 k
June 12, 2013

fractions
3/4 and 7/8
June 11, 2013

Math 208
nico is saving money for his college education. He invests some money at 6%, and \$1400 less that that amount at 5%. The investments produced a total of \$172 interest in 1 yr. how much did he invest at each rate?
May 20, 2013

Social studies
How did monteqeieus system reflect John lockes ideas about government ?
May 19, 2013

Math
A kite is 32m above from the ground. The angle the kite string makes with the ground is 39°. How long is the kite string, to the nearest metre?
April 29, 2013

Math
For a Normal distribution with mean, mu=2, and standard deviation, sigma = 4, 70% of all observations have values between x and y . (Round to 4 decimal places.)
April 15, 2013

chemistry
Fe2O3(s) + 3H2(g) = 2Fe+3(s) + 3H2O (lig) -6e Fe(III) = +3 Oxygen = -2 Fe(III) Oxide then would need 2 Fe(III) to give +6 and 3 Oxygen to give -6 in valence charges to give a neutral molecule.
April 15, 2013

Algebra
Need help finding composition of functions. I am doing something wrong continue to get wrong answer f(x)=x+6/x+5, g(x) = 2x-7. Find (fog)(x)
March 25, 2013

chemistry
i would like to know how to work through it
March 23, 2013

chemistry
What fraction of piperazine (perhydro-1,4-diazine) is in each of its three forms (H2A, HA–, A2–) at pH 8.98?
March 23, 2013

chemistry
Determine [Zn2 ], [CN–], and [HCN] in a saturated solution of Zn(CN)2 with a fixed pH of 1.78. The Ksp for Zn(CN)2 is 3.0 × 10–16. The Ka for HCN is 6.2 × 10–10.
March 23, 2013

chemistry
Consider a solution made by mixing 500.0 mL of 0.04182 M Na2HAsO4 with 500.0 mL of 0.03645 M NaOH. Complete the mass balance expressions below for Na and arsenate species in the final solution. There are 4 arsenate species, but I only got three of them. I am unsure of what the...
March 23, 2013

quantitative chemistry
Consider a solution made by mixing 500.0 mL of 0.04182 M Na2HAsO4 with 500.0 mL of 0.03645 M NaOH. Complete the mass balance expressions below for Na and arsenate species in the final solution. There are 4 arsenate species, but I only got three of them. I am unsure of what the...
March 22, 2013

quantitative chemistry
Determine [Zn2 ], [CN–], and [HCN] in a saturated solution of Zn(CN)2 with a fixed pH of 1.78. The Ksp for Zn(CN)2 is 3.0 × 10–16. The Ka for HCN is 6.2 × 10–10. I know the following is what needs to be done, but im unsure of how to go about it. 1. ...
March 22, 2013

chemistry
Determine the molar solubility (S) of Zn(CN)2 in a solution with a pH = 4.91. Ksp (Zn(CN)2) = 3.0 × 10-16; Ka (HCN) = 6.2 × 10-10.
March 21, 2013

chemistry
Ignoring activities, determine the molar solubility of copper (I) azide (CuN3) in a solution with a pH of 10.83. Ksp (CuN3) = 4.9 × 10–9; Ka (HN3) = 2.2 × 10–5.
March 21, 2013

Art
Describe how elements of art and principles of design work together to form a composition
March 19, 2013

art
Analyse a work of art for example Jacob Lawrence "GOING HOME" to describe how he used both elements of art and principles of design to create a strong composition.
March 19, 2013

Art
Describe how elements of art and principles of design work together to form a composition
March 19, 2013

college algebra
I need help bad. Don't know which formula to use. Please explain step by step. 2x^2-12x+19. Find the interval where f is increasing and decreasing.
March 18, 2013

Math
Find the number of each kind of object in the collection. Sue's Card Collection 8 packs of baseball cards 3 fewer packs of hockey cards than football cards 17 packs in all
March 14, 2013

Physical Science
March 11, 2013

programming (C#)
Write a console-based program that accepts a user's message and determines whether it is short enough for a social networking service that does not accept messages of more than 140 characters.
March 2, 2013

Multivariable Calculus
Find the linearization L(x,y)of the function f(x,y) at P_0. Then find an upper bound for the magnitude |E| of the error in the approximation f(x,y)=L(x,y) over the rectangle R. f(x,y) = (1/2)x^2 + xy + (1/4)y^2 + 3x - 3y + 4 at P_0(2,2),R:|x-2|<=0.1, |y-2|<= 0.1
February 26, 2013

algebra
A video game manufacturer is planning to market a new machine. The fixed costs are \$550,000 and the variable costs are \$120 per machine. The wholesale price of the machine will be \$140. How many game machines must be sold for the company to make a profit? my answer was 27,500 ...
February 24, 2013

Chemistry
February 23, 2013

Chemistry
Consider this equilibrium process at 686°C. CO2(g) + H2(g) CO(g) + H2O(g) The equilibrium concentrations of the reacting species are [CO] = 0.050 M, [H2] = 0.045 M, [CO2] = 0.086 M, and [H2O] = 0.040 M. (a) Calculate Kc for the reaction at 686°C. (b) If the ...
February 23, 2013

Algebra II
Write the equation of the circle in standard form. Find the center, radius, intercepts, and graph the circle. x2+y2+16x−18y+145=25 Standard form
February 19, 2013

trigonometry
the answers are 1,-1, and 0 but i'm not sure how to explain how i got them.
February 18, 2013

trig.
thank you!
February 18, 2013

trig.
8x^3+4x^2-4x solution sets
February 18, 2013

pre-calculus
I need help with soving this problem. G(u) =4-3u-u^2; Find G(-2u)
February 17, 2013

Math
A farmer uses 1034 meters of fencing to enclose a rectangular region and also to subdivide the region into three smaller rectangular regions by placing a fence parallel to one of the sides. Find the demensions that produce the greatest enclosed area.
February 10, 2013

Calculus help!
A ball is shot into the air from a bridge, and its height, y, in feet, above the ground t seconds after it is thrown is given by y=f(t) = −16t2 + 55t + 33. What is the average velocity of the ball during the first second? Round your answer to two decimal places.
February 6, 2013

algebra
Need to know the steps to multiply and simplify the expression: (4-z)z=
February 4, 2013

math
find the slope of the given line if it is defind. the line through (2,5) and (0,8) please show work
January 26, 2013

math
a) 1150 dollars invested at 9% annual interest rate (compounded yearly) or b) 1475 invested at 6% annual interest (compounded yearly) after When would the two investments have equal value?
January 25, 2013

math
A culture of bacteria grows exponentially. It doubles in size every 16 hours. How long will it take to triple from its original size?
January 25, 2013

math
An innovative rural public health program is reducing infant mortality in a certain West African country. Pretend the program in Senegal has been reducing infant mortality at a rate 8.1 % per year. How long will it take for infant mortality to be reduced by 30 %?
January 25, 2013

math
assume the substance has a half-life of 11 years and the initial amount is 126 grams.How long will it be until only 15 % remains?
January 25, 2013

Math
assume the substance has a half-life of 11 years and the initial amount is 126 grams. How much remains at the end of 8 years?
January 25, 2013

Algebra
Suppose that the annual interest rate on your checking account is 7.5 percent compounded continuously. In order to have \$ 6300 in 7 years, how much should you deposit now? Assume, that the current balance is \$ 0.
January 25, 2013

Statistics
The estimated standard error, sM, provides a measure of the average or standard distance between _____. a score and the population mean (X and ì) a sample mean and the population mean (M and ì) a score and the sample mean (X and M) None of the other options is ...
January 23, 2013

math
2,6,10,14, what is the next number at ate a/30 place. a/n=-2+4n a/30=?
January 22, 2013

English
I am reading an article about Britney Spears leaving the X-Factor. On of the lines says "she wasn't a great judge, but she didn't shave her hair off or anything, so she proved herself capable of keeping together." I feel like this might be a logical fallacy, ...
January 21, 2013

math
d=170 feet,t=34seconds r=ft/sec
January 20, 2013

calucus
Draw the graph of y=-2f(x+1)-3
January 17, 2013

Physics
A ball of mass m(1) = 0.250 kg and initial v(1) = 5.00 m/s collides head-on with a ball of mass m(2) = 0.800 kg that is initially at rest. What are the velocities of the balls after the collision if they stick together?
January 11, 2013

calculus
The base of a cell phone tower is an equilateral triangle with sides 10 ft long. How far is one corner of the triangle from the center of the of the triangle?
December 9, 2012

Personal Dimension of Educatio
Compound subjects those joined with and should take singular verbs. For example: the cd player and moon roof is included in the car's price. True or False. My answer is False.
November 16, 2012

Personal Dimension of Educatio
Titles of works and company names should be treated as singlular nouns. For example: the Secret Life of Bees is a novel that was made into a movie last year. True or False. My answer is True
November 16, 2012

Personal Dimension of Educatio
Most singular nouns that end in "s" such as politics, news, measles- take plural verbs. for example: The local news are a good source for community events. True or False.. My answer is False
November 16, 2012

Personal Dimension of Educatio
Select the sentence that has correct subject-verb agreement. 1. Everyone on the guest list are attending the dinner. 2. Everyone on the guest list is attending the dinner. My answer is 2
November 16, 2012

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