# Posts by help

Total # Posts: 1,481

**Physical Science**

A 1000-kg car is moving east at 80 km/h collides head on with a 1500-kg car moving west at 40 km/h, and the two cars stick together. Which way does the wreckage move and with what initial speed?

**algebra**

Y=32 x=8

**Physical Science**

A 40-kg skater moving at 4 m/s overtakes a 60-kg skater moving at 2 m/s in the same direction and collides with her. The two skaters stick together. What is their final speed?

**Physical Science**

A boy throws a 4-kg pumpkin at 8 m/s to a 40-kg girl on roller skates, who catches it. At what speed does the girl then move backward?

**Physical Science**

A force of 10 N is used to lift a 600-g ball from the ground to a height of 1.8 m, when it is let go. What is the speed of the ball when it is let go??

**Physical Science**

What do I put my answers in? So the anwser will be 14*8??

**Physical Science**

An escalator 14 m long is carrying a 70-kg person from one floor to another 8 m higher. The escalator has a speed of 1.0m/s. How much work does the escalator do in carrying the person to the top?

**functions**

what is the domain of f(x)={2x^2 -2,if x < or= 1 {x+1,if x>1?

**geometry**

m<AOC=7x-2, m<DOC=2x+8, m<EOD=27 find the value of X

**geometry**

mÚAOC = 7x - 2, mÚDOC = 2x + 8, mÚEOD = 27 help me find the value of x

**math**

Consider the following list of premises: a ^ :b ! c; :a ! :d; Show that g is a valid conclusion by constructing a step-by-step argument

**physics**

An aluminum rod at 18 degrees Celsius has a length of 2.50 meters. At what possible temperatures will it's length change by 1cm?.

**algebra 2**

Find the inverse of the function. f(x) = e^-x + 5 f(x) = 10^x + 2

**Chemistry**

Or would it be just 35.5 grams in Cl?

**Chemistry**

I meant 443.75 g, would that be correct

**Chemistry**

Would it be 43.75g

**Chemistry**

how many grams are in 12.5 moles of chlorine (gas)?

**algebra II**

use alaytical and graphical methods to solve the inequality. (3x+6/7x^2+5) > 0

**algebra II**

x^3+10x^2+31x <= -30 (2x/x+1) <= (4/x-3) if the signs mess up there both less than or equal too.

**algebra 2**

use analytical and graphical methods to solve the inequality. x^3+10x^2+31<=-30 (2x/x+1)<=(4/x-3)

**algebra 2**

use analytical and graphical methods to solve the inequality. x^3+10x^2+31¡Ü-30 (2x/x+1)¡Ü(4/x-3)

**algebra 2**

Use analytical and graphical methods to solve the inequality. (3x+6)/(7x©÷+5)>0 m©ø-4m¡Ã0

**algebra 2**

use analytical and graphical methods to solve the inequality. x©ø+10x©÷+31 ¡ -30 (2x/x+1)¡(4/x-3)

**algebra II**

The profit made when t units are sold, t>0, is given P=t²-36t+320. Determine the number of units to be sold in order for P>0 (a profit is made).

**Algebra II**

Im sorry i typed it wrong. The profit made when t units are sold, t>0, is given P=t²-36t+320. Determine the number of units to be sold in order for P>0 (a profit is made).

**Algebra II**

The profit made when t units are sold, t>, is given by P²-36t+320. Determine the number of units to be sold in order for P>0 (a profit is made).

**Algebra II**

f(x)= 1/(x+2) i have to graph this, can some one please help me!

**Pre calculus**

f(x)={ x+5, if x>0 3, if x<=0 Graph the function can someone please help

**Pre calculus**

f(x)={ x+5, if x>0 3, if x<=0

**Algebra II**

f(x)= 1/(x+2) i have to graph this, can some one please help me!

**Algebra 2**

f(x)= x+5, if x>0 3, if x<=0 how do i graph and solve this function?

**Algrbra II**

f(x)= x+5, if x>0 3, if x¡Ü0 and how would i graph this?

**Algebra**

use factoring to solve the equation 4x²-23x=6 I think the answer is x=-1/4,x=6 Just want to make sure that's right

**Algebra II**

5/(x-3)

**Algebra II**

Find the inverse of the function: f(x)=-x²+16, x≥0 f(x)=5/x-3

**Algebra II**

If an object is propelled upward from a height of 16 ft at an initial velocity of 80 feet per sec, the its height after t seconds is given by the equation h=-16t²+80t+16, where h is in feet. after how many seconds will the object reach a height of 116 ft?

**Algebra II**

A projectile is thrown upward so that its distance above the ground after t sec is given by h(t)=-11t²+264t. After how many seconds does it reach its maximum height?

**Pre calculus**

Please help me! Find the exact solutions to the quadratic equation in the complex numbers. (x-13)²=-36

**Algebra II**

Given the folllowing revenue and cost functions, find the maximum profit. R(x)=72x-2x²; C(x)=24x+93.

**MATH**

If the average cost per unit C(x) to produce x units of plywood is given by C(x)= 1200/x+40, What it the unit cost for 800 units? How much do 800 units cost in all?

**Mathematics**

At football practice, players do a 20-minute warm-up before starting their practice drills. After the practice drills, they do a 10-minute cool-down. The expression 20+d+10 describes the length of practice, where d is the number of minutes the practice drills last. How long, ...

**science**

which two gases have been added to Earth's atmosphere in large amounts and are believed to have increased global warming by absorbing infrared radiation? 1. neon and argon 2. chlorine and nitrogen 3. hydrogen and helium 4. methane and carbon dioxide

**chemistry**

Give the formula of lead iodide showing all working. You must use knowledge about atoms and electron configuration to explain answer. Thanx :)

**Calculus**

How do you integrate a radical function such as f(x)= ã(7&4x^5 )- 3ã(6&x^5 )- 11∜x +3∛x ? Describe your strategy.

**Biology**

Habitat limits result in a populations A)salinity B) temperature C) physical obstacles D) biogeographic range

**Math**

Find the distance between the two points of each pair. Found to the nearest tenth. (1,5) , (5,2) Is the answer 4.5?

**math**

So no?

**math**

Mr.perez is trying to move a circular folding table with a 4 foot radius through a window that measures 5 ft by 3 ft. He plans to lean the table over and move it through the diagonal of the window. Will the table go through the window?

**Math**

Idk u tell me

**chem**

@ 46degress C a 1L sample of ammonia gas has a prssure of 5.3 atm. what is the pressure in atm on the sample when the volume is reduced to 100ml with no temp change?

**Compound math**

(Future Value) Suppose you invest $8000 into an account that pays an annual interest rate of 6.2%. How much is in the account after 30 years if a. simple interest is compound monthly? b. interest is compounded monthly? c. interest is compounded daily?

**human resources**

I am preparing a line budget and a functional budget. I need to know how a functional budget example look. There are two different programs; one program uses 60% and the other 40%, I need an example of how the budget should actually look.

**english**

Education in financial planning teaches (simple present tense) me how to save money for my children’s college education. Could someone tell me if this is correct?

**CHEMISTRY**

What atomic orbital has the quantum numbers n = 3, l = 1, ml = -1?

**CHEMISTRY**

In the emission spectrum of hydrogen what is the wavelength of the light emitted by the transition fro m n = 4 to n =2.

**CHEMISTRY**

Determine the heat of combustion of acetylene (C2H2).

**CHEMISTRY**

Determine the heat of combustion of acetylene (C2H2).

**CHEMISTRY**

Determine the heat of combustion of acetylene (C2H2).

**CHEMISTRY**

Determine the heat of combustion of acetylene (C2H2).

**chemistry**

A 6.58g sample of compound was placed in a 12.6 L container. At 25.0*C, the pressure was found to be 0.75 atm. what is this compound?

**math**

Ben can complete 4 math problems in 20 minutes. If he continues working at the same rate, how long will it take Ben to complete 17 math problems?

**8th grade math**

If two numbers are relatively prime, what is their LCM? Explain your reasoning and give 2 examples supporting your answer.

**8th grade math**

The denominator of a fraction is 4 more than the numerator. If both the denominator and the numerator are increased by 1, the resulting fraction equals ½. What is the original fraction?

**physics**

This is wrong. The 0m/s should be with the mass of the target, not of the arrow.

**chemistry**

Sleeping pills often contain barbital, which is weakly acidic (pKa = 8.00). For analysis of the barbital content of a sleeping pill, a titration is carried out with strong base. It takes 12.00 mL of 0.200 M base to reach the stoichiometric point. If the initial acid ...

**maths**

height=6 feet length=5 feet breadth=4 feet volume of the container=120 cubic feet how do you convert it into litres?

**maths**

height=6 feet length=5 feet breadth=4 feet what is the volume of the container in liters?

**Math**

there are 3 red marbles , 3 blue marbles and 1 green marble in a bag. A marble is drawn at random from the bag and not replaced. Then a second marble is drawn. What are all the possible outcomes?

**Math**

Is it b

**Math**

A triangle has 2 angles that measure 60 each. Which of the following best describes thiz triangle. A. Right isoseles triangle B. Equilateral triangle C. Obtuse isosceles triangle D. Acute scalene triangle

**Math**

Every morning Leah runs about 5/8 mile. At this rate, about how many miles does leah run in 2 weeks?

**Math**

Find two numbers with a sum of -8 and a difference of 4. Let x be the greater number and y be the lesser number?

**MATH**

Describe the advantages and disvanteges of seeing a rule for a function rather than listing a function values in a table

**Pre-A;lgebr**

Write a rule for the linear function with slope m and y-intercept b. m= -1/3, b= -2

**chemistry**

The total pressure in a 11.3 L automobile tire is 44 psi at 11°C. By how much does the pressure in the tire rise if it warms to a temperature of 29°C and the volume remains at 11.3 L?

**Math**

y= 3/5x - 6 x= 4

**physics**

A diver springs upward from a board that is three meters above the water. At the instant she contacts the water her speed is 9.30 m/s and her body makes an angle of 83.0° with respect to the horizontal surface of the water. Determine her initial velocity, both magnitude ...

**Algebra**

have no idea how to do this... divide and write your answer WITHOUT exponents. -11.2 x 10^-7 _______________ = 1.6 x 10^-2

**writing**

so i have to write a research paper(3-4 pages) on this topic 'does lack of sleep affect heart rate' how do i do that...this is the first time i write a research paper so i need help..thanks

**physics**

The engines of a 1.20 x 10^5 N rocket exert an upward thrust of 2.00 x 10^5 N for 1.50 minutes upon lift off. What is the impulse exerted on the rocket? What is the velocity of the rocket at the end of the 1.50 minute period? physics - bobpursley, Thursday, February 3, 2011 at...

**physics**

I don't understand where the 90 comes from

**physics**

The engines of a 1.20 x 10^5 N rocket exert an upward thrust of 2.00 x 10^5 N for 1.50 minutes upon lift off. What is the impulse exerted on the rocket? What is the velocity of the rocket at the end of the 1.50 minute period?

**Chemistry**

Hydrogen gas has been suggested as a clean fuel because it produces only water vapor when it burns. If the reaction has a 95.4% yield, What mass of hydrogen forms 94 Kg of water?

**Chemistry**

Maxine is studying about electrolytes in her chemistry class. The teacher asks her to test 4 different solutions to determine how well each one conducts electricity. which solution will best conduct electric current? a) HC2H3O2 b) C2H5OH c) KOH d) H2O2

**chemistry**

Calculate the moles of Cl atoms in 0.0565g of C2H4CL2 i got 6.87 x 10^20 mol Cl atoms <-- is that right?

**Physic**

How does doubling the mass of one object and tripling the distance between another object change the gravitational force betweem them? FG = G M1 M2 / r2 a. Force changes by 2/3 b. Force changes by 2/9 c. Force increases by 9 d. Force decreases by 3 e. No change in force

**psychology**

the question: Some size/distance cues are useful for distant objects, others for close objects. Provide one example of a cue that would be good for near objects, and one for distant objects. Explain why the cues you have selected would be less useful for objects at other ...

**Math**

Is the price of a piece of cloth a function of the length of the cloth? Explain

**Math**

Is the price of a piece of cloth a function of the length of the cloth? Explain

**physics**

Two point charges, 4.0×10-6 C and -1.0×10-6 C, are located on the x axis at = -1.0 cm and = 3.0 cm. (a) Determine the electric field at the origin. (b)Determine the x coordinate of a point on the positive x axis where the electric field is zero; i.e., a test charge...

**physics**

Inside a perfect conductor 1)the electric potential is zero throughout, even at the surfaces. 2)the electric field is zero throughout, even at the surfaces. 3)the electric potential is constant throughout, even at the surfaces. 4)none of the above is correct. I have no idea??

**physics**

Never mind I figured it out:)

**physics**

A charge Q = -520 C experiences a downward force of 0.04 N. What is the electric field in N/C at the point where the charge is located? Take upward to be positive. I know that E=Kq/r^2 therefore E= (9.0*10^9Nm)(-520*10^-6c)/r^2 I'm not sure how to get the distance and what...

**Algebra**

find the measure of an angle whose supplement measures two times its measure

**Math**

is 1/2 2?

**Math**

1/2x > -3

**Math**

-3x < 0

**Math**

What happens to the inequality symbol when you do the following to each side of an inequality? 1. Subtract a negative number

**Math**

1/2x > -3

**Math**

18 < -2m would the anser be m < -9?