# Posts by Tom

Total # Posts: 1,421

**Algebra**

It is possible for a quadratic equation to have no real-number solutions:Solve : x2 + 5x + 3 = 0

**chem**

it dissolves

**algebra 2**

If Q varies inversely as the square root of R and Q=2 when R=4, what is Q when R is 25? does Q=625 im not sure can someone double check it for me.

**algrebra 2**

can someone please help me im stumped on these two. use analytical methods to solve the equation. 1+(1/x)=(42/x²) (7/x-4)=1+(9/x+4)

**algebra**

Solve using the substitution method. Show your work. If the system has no solution or an infinite number of solutions, state this. 4x + 4y = -36 4x + 4y = 12

**Chemistry**

For the reaction HNO3+HCl=NO2Cl+H20 What is the equilibrium constant at 25 C and 75 C

**statistics**

.099

**trig**

sinx+sinxcot^2x=cscx prove each identity

**trig**

tan(theta)-1= sin^2(theta)-cos^2(theta)/ sin(theta)cos(theta)+cos^2(theta) prove each identity

**Chemistry**

sulfur

**chemistry**

what is the volume of 4.4 moles of Cl2 at 285 kelvin and 0.87 atm. (R=0.0821 k*atm/mol*k)

**Math**

3(x-2)+4(2x-6)=6(x-4)+8(2x+1)x=

**Math**

What is the square root of 6 times the square root of 9 if there is no perfect square of 6

**english**

1890-1950 American MLA Format

**english**

I need to write a mini research paper on a modernist poet of my choice... I'm having trouble deciding on what poet to use and how i can develop a strong thesis.. any help would be much appreciated.

**american government**

The factor that normally has the most impact on the president's level of popular support is a. world conditions. b. the condition of the nation's economy. c. the national crime rate.d. the president's skill in the use of television. e. the condition of nation's...

**Statistics**

Suppose that the average grade for all people who take this course in statistics is 83 with a standard deviation of 3.5. If your particular class has an average of 89, can you conclude that your class is better than average at the 90 percent confidence level? Label and ...

**physics**

The function y(x, t) = (25.0 cm) cos(ðx - 15ðt), with x in meters and t in seconds, describes a wave on a taut string. What is the transverse speed for a point on the string at an instant when that point has the displacement y = +22.0 cm?

**Chemistry**

so if the pka is 4.5 the range will be from 3.5 to 5.5?

**Chemistry**

what is the pH range of the buffering region? is that when ph=pKa?

**government**

the federalist papers were written to what? win support for the constitution in new york expose the lack of civil liberties protected in the constitution urge ratification of the constitution in virginia condemn the constitution for the absence of any metioned god

**UCI Chemistry Webworks**

For the following balanced equation: 2 Ag+ (aq) + Cu(s) <<->> Cu2+ (aq) + 2 Ag(s) Which letter corresponds to the correct cell notation at standard state conditions? A. 2Ag+(aq) | Cu2+(aq) || 2Ag(s) | Cu(s) B. Cu(s)| Cu2+(aq) || Ag+(aq) | Ag(s) C. Ag+(aq) | Cu2+(aq...

**account/check please**

answer is A

**math**

do you know how to solve it

**math**

Male: 60,63,65,70,66,80,85,73,79,80,83,85,81,76, 77,90,91,88,78,92 Females: 62,69,70,72,78,77,79,83,80,88,90,90,98,100, 66,67,65,63,69, 83 Can you hellp me I need to find: A) P value and the Z value of this data with a Alpha Value of 0.05.

**MATH Please help me**

Male: 60,63,65,70,66,80,85,73,79,80,83,85,81,76, 77,90,91,88,78,92 Females: 62,69,70,72,78,77,79,83,80,88,90,90,98,100, 66,67,65,63,69, 83 Can you hellp me I need to find: A) P value and the Z value of this data with a Alpha Value of 0.05.

**Math (stastiscs)**

Male: 60,63,65,70,66,80,85,73,79,80,83,85,81,76, 77,90,91,88,78,92 Females: 62,69,70,72,78,77,79,83,80,88,90,90,98,100, 66,67,65,63,69, 83 Can you hellp me I need to find: A) P value and the Z value of this data with a Alpha Value of 0.05.

**Math**

A lawn service will fertilize a lawn at at a rate of 59cents per 100 square feet. What is the price they will charge to fertilize a 125foot x 140foot rectangular lawn? Express answer to the nearest cent.

**math**

1/9

**physics**

Stan raises a 1110 N piano a distance of 5.00 m using a set of pulleys. Stan pulls in 20.0 m of rope.

**statistics**

If you have a population mean of 50 and a population standard deviation of 5 and you select a sample size of 100, what is the probability that the sample mean is between 47 and 49.5?

**math**

how do I determine the compounding rate required to turn $350 into $14,000 over 30 years? Thank you

**physics**

DONT KNOW CAUSE THERE IS NO FORMULA FOR IT

**Chemistry**

Magnesium is found in the ore,magnesite, MgCO3. The ore decomposes when heated to form magnesium oxide and carbon dioxide. Write the balanced equation for this reaction.

**chemistry**

What is the pH of a solution made by adding grams of NH4Cl, to 550 mL of 0.205 M NaOH?

**math**

can some one help 3>4+5+

**substition algebra**

solve x & y: 3X-6Y(-6X+34)=30

**Math**

Sean's mom was 27 years old when he was born. When Sean is 14 years old his mother's age will contain the same two digits as Sean's age. The next time that Sean's age and his mother's age contain the same 2 digits ____ years later.

**Math**

Today Justin reached 1/11 the age of his mother was when he was bron. Today, Justin's mother is _____ times as old as Justin.

**Math**

find the derivative f(x)= 4xe^x f(x) = ln (2z-11)^7 f(x) = ln (x-1/3x+1)

**chemistry**

. Given the following stocks 4M NaCl, 3M NaOH, 5M HCl (a) Prepare 200ml of a solution containing 0.5M NaCl and 0.1M (b) Prepare 300ml of a solution containing 0.5M NaCl (c) Prepare 200ml of a solution containing 0.5M NaCl and 0.1M HCl

**algebra**

Tad was delivering lunch to a local office building. His first delivery was to the middle floor of the building. He then took th elevator up 4 floors for the next delivery, down 6 floors for his third delivery, and up 7 floors for his final delivery. He was then on the top ...

**physics**

At the equator, the earth’s field is essentially horizontal; near the north pole, it is nearly vertical. In between, the angle varies. As you move farther north, the dip angle, the angle of the earth’s field below horizontal, steadily increases. Green turtles seem to...

**Fractions**

Add the following. 1/2+3/12+1/4; 3/12+1/2+1/4;5/6+1/3;1/4+3/8+1/4

**Fractions**

Crate has 24 pieces of fruit . 1/2 are oranges, 1/4 are mangos and 2/8 are pineapples. Howmany oranges are there, how many mnagos and how many pineapples? Al ate 1/8 of a sandwich,Bob ate 1/8, then Bill ate 1/4. How much did they eat all together? What fraction was left. 24 ...

**Fractions**

24 students. 2/3 have brown hair, the rest blond hair. How many students have brown hair. What fraction of the students have blonde hair and how many students is that?

**Fractions**

Actually the question was wrong> 24 pieces of fruit. 1/2 are oranges, 1/4 are mangos, and 2/8 are pineapples. How many oranges, how many mangos and how many pineapples are there?

**Fractions**

Ms.Perez has a crate of 24 pieces of fruit. 1/2 are oranges, 1/4 are mangos, and 2/3 are pineapples. How many or oranges? How many or mangos? How many are pineapples?

**math**

stacy multiplied 5x9 and said the answer was 44. what two patterns could you use to show that her answer is not correct?

**math**

Shawna thinks that 8x2=17. what number pattern shows that she not correct?

**math**

Select a variable (mean, proportion, variance or standard deviation) of interest to you and collect data consisting of at least 30 values. Define the variable. Define the population. Describe how the sample was selected. Use Microsoft Excel (and MegaStat if at all possible) to...

**Physics**

A radioactive nucleus is at rest when it spontaneously decays by emitting an electron and neutrino (as shown in the figure below ). The momentum of the electron is 8.11 x 10−19 kg·m/s and it is directed at right angles to that of the neutrino. The neutrino's ...

**Physics**

A radioactive nucleus is at rest when it spontaneously decays by emitting an electron and neutrino (as shown in the figure below ). The momentum of the electron is 8.11 x 10−19 kg·m/s and it is directed at right angles to that of the neutrino. The neutrino's ...

**Physics**

A radioactive nucleus is at rest when it spontaneously decays by emitting an electron and neutrino (as shown in the figure below ). The momentum of the electron is 8.11 x 10−19 kg·m/s and it is directed at right angles to that of the neutrino. The neutrino's ...

**Calculator help**

i have a ti 83, and i want to plug this equation r=1+cos(theta)( this is polar coordinates) into my calculator but the graph does not look right. i think i messed around with the windows or table set menu and i cant fix it. can someone tell me what numbers i should put in my ...

**Physics -- Help!!**

If you launch a ball precisely 8' vertically how long does it take to go from the ground to 8' and back to the ground? If you then launch the same ball precisely 10' vertically, how much longer will it take to return to the ground?

**Physics**

I launch a ball vertically precisely 8' in the air. Then I launch a ball vertically 10' in the air. How much longer will it take the ball to travel 10' versus 8'? Put differently, how much more time does it take the ball to go the 2' further (travelling up ...

**Physics**

When mass M is at the position shown, it is sliding down the inclined part of a slide at a speed of 1.89 m/s. The mass stops a distance S2 = 2.1 m along the level part of the slide. The distance S1 = 1.18 m and the angle θ = 35.10°. Calculate the coefficient of ...

**Math**

If a player makes an average of 60% of his free throw attempts, what is the probability he will make both shots of a one-and-one (to have an opportunity to shoot a second free throw he must make the first)?

**calc**

find the arc length of f(x)=x^2/2

**chemistry**

what is the molarity if 0.5 grams of sodium chloride is dissolved to make 0.05 mL of solution?

**unit circle**

how does the direction ( clockwise or counterclockwise effect the values of the unit circle? what does it mean?

**physics**

A car is driven east for a distance of 49 km, then north for 21 km, and then in a direction 30° east of north for 27 km. Determine (a) the magnitude (in km) of the car's total displacement from its starting point and (b) the angle (from east) of the car's total ...

**English**

Explain why rhythm and rhyme are used in epic poetry.

**algebra**

Given that XY =21 and 1 < x < 2, find the sum of the upper and lower bounds of Y. Express your answer as a decimal.

**trig**

if cos(pi/4) is sqrt2/2 i thought sec(pi/4) is 2/sqrt 2,but its just sqrt 2 . can some one please explain.

**Algebra**

The five-digit number 31d26 ----- is divisible by 3. Find the sum of all possible values of d.

**algebra**

Find the number of square units in the area of the region in the first quadrant which is bounded by x = 4, the y-axis, y = 2, and y = 8.

**CALC**

INTEGRAL OF Y^2/(25+Y^2)

**world history**

How did the Renaissance contribute to the Age of Exploration? by emphasizing the importance of converting people to Christianity by awakening a spirit of discovery and innovation in Europe by fostering a belief in the importance of working as a group by persuading Europeans ...

**calc**

find integral using table of integrals ) integral sin^4xdx this the formula i used integral sin^n xdx =-1/n sin^n-1xcosx +n-1/n integral sin^n-2 using the formula this is what i got: integral sin^4xdx=-1/4sin^3xcosx+3/4 integral sin^2xdx= -1/2sinxcosx+1/2 integral 1 dx can ...

**algebra**

a speaker was so boring that one-half of the audience left after a few minutes. Five minutes later, one-third of the remaing audience left. Ten minutes later, one-fourth of those remaining left, leaving only nine people in the audience. How many people were in the audience at ...

**geometry**

The road rose at an 8 degree angle, what is the grade?

**math**

A peddler is taking eggs to the market to sell. The eggs are in a cart that holds up to 500 eggs. If the eggs are removed from the cart 2,3,4,5, or 6 at a time, one egg is always left over. If the eggs are removed 7 at time, no eggs are left over. How many eggs are in the cart?

**Symbolic Logic**

1) Give a general proof to show that for all sentences X and Y and for every consistent set Σ of sentences, if X and Y are logical consequences of Σ, then the set {X, Y} is consistent. 2) Let C be a logical consequence of the set {P1, P2, P3} and of the set {P1, P2, ...

**pre cal**

An airplane is flying at an altitude of 2500 feet parallel to the ground, and the ground distance to the start of the airport runway is 7500 feet.

**Physics**

30 21 2

**chemistry**

at 25˚c the density of water is 0.997g/cm³,the density of ice at -10˚c is 0.917g/cm³. if a soda can volume is 240 ml is filled then frozen at -10˚c, what volume does solid occupy?

**Algebra**

What system of equations do I use to solve the following question? A boat traveled 336 miles downstream and back. THe trip downstream took 12 hours. THe trio back took 13 hours. What is the speed of the boat in still water What is speed of the current?

**math**

first find the common denominator of 6 so you get 2/6 + 5/6 then you add straight across to get 7/6 over 2/5. when you divide the fractions, take the denominator and flip it to then multiply straight across so, you have 7/6 * 5/2 = 35/12

**Manufacturing**

Discuss how it is possible that schools put up barriers to enrolling a child with emotional disabilities

**Statistics**

Given a mean of 60 and a standard divation of 7, what proportion of scores is between 45 and 78? What is the formula for determining this proportion?

**Statistics**

Given a mean of 60 and a standard divation of 7, what percentate of scores ae 73 or less? What is the formula for determining this value?

**Algebra**

Lee took a survey for the school newspaper and received the following data about the number of hours classmates studied per week: (1,2,4,5,6,8,9,10,10). Express as a common fraction the positive difference between tthe median and mean of this set of data.

**trig**

a plane is flying at an altitude of x with the distance at 800 meters with an angle of 70 degress. what equation would you use to solve. tan70= x/800 tan70= 800/x sin70= x/800

**chemestry**

an oilo slick 110 nm 1.0 * 10^6 square meters of ocean.How many liters of oil are in the slick

**com/155**

five sentences about the role of education in successful financial planning

**Chemistry**

CH3COOH + H2O = CH3COO- + H3O+ Acid acetic is a weak acid so not all of it will dissociate. The constant for acid acetic is 1.8 . 10^-5 therefore 1.8x10^-5=(x^2)/(0.2-x) x is the amount that disociated solve the equation and x is 1.88x10^-3 pH=-log(pH)=-log(1.88x10^-3)=2.72

**Physics**

A laser emitting at 632.8nm illuminates a double slit. A screen is positioned 2.00 m from the slits. Interference fringes are observed with a separation of 1.0 cm. (a) Determine the separation of the slits. (b) Determine the angle of the first-order dark fringes.

**social studies 20-1 (URGENT)**

thats the thing i do not know what these sources mean and how they relate to nationalism. if smeone explains them to me then i can do the rest myself.

**social studies 20-1 (URGENT)**

examine each source below and write in paragraph form, a response in which you: -interpret each source to identify and explain the perspective(s) related to Nationalism. -identify and discuss one or more ideological concepts that are refleted in the sources. -Use your knowlage...

**Math**

you are 70 meters from train and road crossing with the train going 60meters per second, after 4 seconds has fast is the train traveling away from you?

**calc**

A kite 100 ft above the ground moves horizontally at a speed of 8 ft/s. At what rate is the angle of elevation between the string and the horizontal decreasing when 200 ft of string have been let out?

**chem100-1**

Can eletrolysis be used to separate salt in the sea int o elemental sodium and clorine gas -- somthing like 2NaCl --> 2Na + Cl2 ?

**economics**

"The Fed should simply increase the money supply at the same rate that the full employment economy grows, and the government should desist from any stabilizing urges." What school of thought would make this suggestion, and how do economists of that school justify ...

**physics**

A car of mass 1979 kg drives over a semicircular hilltop of radius 12.6 m and through a semicircular valley of radius 17.2 m with a constant velocity of 7.28 m/s. What is the normal force on the car at the bottom of the valley? would i use the equation mv^2/r +mg ?

**algebra**

two runners jog around an oval path at constant rates, but in opposite direstions. one runner completes a lap every 10 minutes, and the other does a lap every 12 minutes. how many minutes elapse between consecutive meetings of the runners? express answer as a mixed number.

**physics**

if you exert a force of 500 N to walk 4 m up a flight of stairs in 4 s, how much

**math**

Six people are going to be seted in a row of 8 chairs. How many different ways may they be seated?