# Posts by SAra

Total # Posts: 4,513

**math**

Thank you for your help

**math**

what is the value of -3/4-(3/-8) (the 3/4 fraction only has the - on the 3, not the entire fraction) a -1 1/8 B -3/8 C3/8 D 1 1/8 What I did is first find a common denominator making the equation -6/8-(3/-8)= -9/16 this is not one of the choices Can you please help. Thank you

**physics**

When is the kinetic energy equal to zero?

**chem.**

The combustion of a polymer gives only carbon dioxide and water. Its average molar mass is 10500g/mol and its degree of polymerization is 2500. Determine the molar mass the formula and the name of the monomer. Draw the formula of the polymer what is its name. Thanks.

**math**

Thank you, I know I didn't know what symbol to use for absolute value, that is why I said I did the absolute value of..., but what are they asking for in the second part when asking What conclusion can you make from the mad value you found? I am not sure what they want. ...

**math**

can you please check my work. The time in minutes that it took five students to complete the math test was 45, 27, 30, 25, and 48. What is the mean absolute deviation of the times? I did 25+27+30+45+48= 175 then I divided it by the 5 students. 175/5= 35 so now I did the ...

**Physics**

A block is projected up a frictionless inclined plane with initial speed v0 = 2.19 m/s. The angle of incline is θ = 25.1°. (a) How far up the plane does it go? (b) How long does it take to get there? (c) What is its speed when it gets back to the bottom?

**Physics**

Three astronauts, propelled by jet backpacks, push and guide a 118 kg asteroid toward a processing dock, exerting the forces shown in the figure, with F1 = 32 N, F2 = 56 N, F3 = 38 N, θ1 = 30°, and θ3 = 60°. What is the (a) magnitude and (b) angle (measured ...

**1st math**

How far does the minute hand move in an hour?

**math**

sorry composition is actually supposed to be consumption

**math**

Which car is the cheapest to run?Explain why. Bill's car: average fuel composition 20 miles per gallon Sue's car: average fuel composition 30 miles per gallon Fred's car: average fuel composition 40 miles per gallon I think the answer is Fred because his car can ...

**Math**

At a hockey game, a vender sold a combined total of sodas and hot dogs. The number of sodas sold was three times the number of hot dogs sold. Find the number of sodas and the number of hot dogs sold.

**Phys**

A pendulum is constructed of a mass m connected to a mass ess rigid rod of lengthl. As shownin the figure, the other end of the rodis suspended from a point on the ring ofradius R. The pendulum is free to swing in a vertical plane that is also the plane of the ring. The ring ...

**Statistics**

In a prior sample of U.S. adults, the Center for Disease Control (CDC), found that 10% of the people in this sample had pinworm but the margin of error for the population estimate was too large. They want an estimate that is in error by no more than 1.5 percentage points at ...

**Statistics**

Suppose you draw a card from a deck (with replacement) 10 times in a row. What is the probability that you get exactly 3 hearts? Round your answer to 3 decimal places.

**english composition 11**

all of the following are techniques of active reading except

**English**

B?

**Business**

I wonder if someone can help me on question please , Analyse the impact of relevant legislation/regulations on any two types of part time &full time employment contract ?

**Statistics**

TRUE or FALSE: The p-value of a hypothesis test is the probability that the null hypothesisis true given the sample statistic obtained.

**science**

A example of negative feedback a. elevated free t4 resulting in elevated trh b. elevated free T4 resulting in elevated tsh c low free T4 resulting in elevated tsh d. low free t4 resulting in low tsh i think its B. not sure.

**physics**

A 3.30-kg steel ball strikes a massive wall at 10.0 m/s at an angle of θ = 60.0° with the plane of the wall. It bounces off the wall with the same speed and angle (see the figure below). If the ball is in contact with the wall for 0.204 s, what is the average force ...

**physics**

A 0.224-kg volleyball approaches a player horizontally with a speed of 18.0 m/s. The player strikes the ball with her fist and causes the ball to move in the opposite direction with a speed of 22.0 m/s. (a) What impulse is delivered to the ball by the player? kg·m/s (b...

**MATH**

I NEED HELP WITH MULTIPLACATION

**Chemistry**

24.0 mL of 2.4 M silver nitrate is mixed with 32.0 mL of 2.0 M sodium chloride. ( I wrote the balanced equation as AgNo3+NaCl -> NaNo3 + AgCl ) A) Identify the precipitate formed by name and formula. - I wrote AgCl (silver chloride) B) Calculate the mass of precipitate ...

**math**

39?

**physics**

The figure here shows four penguins that are being playfully pulled along very slippery (frictionless) ice by a curator. The masses of three penguins and the tension in two of the cords are m1 = 12 kg, m3 = 16 kg, m4 = 21 kg, T2 = 101 N, and T4 = 202 N. Find the penguin mass ...

**physics**

A daredevil on a motorcycle leaves the end of a ramp with a speed of 35.5 m/s as in the figure below. If his speed is 34.0 m/s when he reaches the peak of the path, what is the maximum height that he reaches? Ignore friction and air resistance. m

**physics**

A 61.0-kg runner has a speed of 3.20 m/s at one instant during a long-distance event. (a) What is the runner's kinetic energy at this instant? KEi = J (b) If he doubles his speed to reach the finish line, by what factor does his kinetic energy change? KEf KEi =

**math**

Ms. Hardin invested $70,000 in three stocks. The first year, stock A paid 6% dividends and increased 4% in value; stock B paid 8% dividends and increased 5% in value; stock C paid 9% dividends and increased 3% in value. If the total dividends were $5180 and the total increase ...

**Economics - URGENT**

Suppose we now care about the long run decisions of a firm that has a production function of the form q = 4L^1/2 + K Suppose w = 1 and r = 0.5 Assume that, at the beginning when w0 = 1 and r = 0.5, the firm chose to produce q0 = 20 units of output. Then, the wage increased to ...

**Statistics**

What is the difference between the population distribution, the distribution of the same, and the sampling distribution and what are the formulas to get the normal distribution of each?

**Statistics**

A sample of size 16 is taken from a normally distributed population with a mean of 12 and a standard deviation of 3. The probability that the sample mean is equal to 12 is a. 1 b. 0.5 c.-0.5 d.0 please explain

**Science**

Thank you for checking my work

**Science**

When hair is combed with a hard rubber comb, the hair becomes positively charged because the comb A. Transfers protons to the hair B. Remove electrons from the hair C. Transfers electrons to the hair D. Remove both times from the hair I could be removed electrons from hair . ...

**Science**

Thank you

**Science**

If you add a battery to a series circuit, what will happen to the current in the circuit? A. The current both stayed the same since there is the same resistance B. The comment will increase since there is less resistance C. The current will increase since there is more voltage...

**calculus**

25pi/3=1/2xsquare root of 100x^2 and plus 50 arcsin(x/10)

**Science**

Which of the following parts of a circuit is not actually necessary for the circuit to function? A. Wire B. Load C. Switch D. Energy source I put B. The load. I know you need wires to function since they connect the parts of the circuit. The switch turns the circuit on. I wasn...

**ocupational therapy aide**

exam for ocupational therapy aide

**Statistics**

We are managing a large soy bean farm. To estimate our revenues for the coming year, we need to estimate our crop yield. Soy bean yields are measured by pods/plant. We are planning for a yield of 40 pods/plant. a. We take a random sample of 64 soy bean plants and get a sample ...

**Geography**

Draw a table like the one below into your exercise book. With reference to the Simple model of an ecosystem (on page 2), suggest possible ways that each of the components of an ecosystem can influence each other. Climate Vegetation Fauna Landforms & Drainage Soils Climate ...

**chem**

use atomic theory to explain why chemical reactions obey the law of conservation of mass

**Math**

Joe spends $8 on lunch and $6.50 on dry cleaning. He also buys 2 shirts that each cost the same amount. Joe spends a total of $52. What is the cost of each shirt.

**math**

a 6-pack of under shirts costs $13.98. This is $3.96 less than the cost of buying 6 individual shirts. if each undershirt costs the same amount, how much does each undershirt cost when purchased individually?

**Chemistry**

In a sample of 100 liters of air a city's 2x10^-8 L of the pollutant SO2. How many ppm by volume ?

**Economics**

Luis’s utility function is u=x^.4y^.6 Suppose that Luis wants to get 60 utils, provide 4 bundles with which he can achieve that level of utility. Please explain

**Economics**

Can you check my answer Consider an individual with a utility function of the form: U(x,y)=xy , and where m=1, px=2, and py=3 , where m is the individual's income or wealth, pi is the price of good i. Calculate the individual's optimal consumption bundle, (x,y) = (...

**math**

plot sin(1*pi*1000t) +2 where v(t) =1 what does this plot for two periods look liek

**Chemistry**

In the preparation of one liter of 2.5 M HCl solution, what is the volume of HCl concentrated (37% w / w, d = 1.19 g / ml) to be used?

**Civics**

What are some common laws I really don't get this can someone explain it to me?

**Math**

A circle is divided into 8 equal parts. What is the total angle measure of 4 parts?

**chemistry**

The titration of 5.40 mL of a saturated solution of sodium oxalate, Na2C2O4, at 25∘C requires 29.4 mL of 2.200×10−2 M KMnO4 in acidic solution. What mass of Na2C2O4 in grams would be present in 1.00L of this saturated solution?

**Electrical Engineering**

Technically it could be either...

**ECE**

Assume that a device exists between two nodes A and B of a circuit and that the voltages of these two nodes A and B are equal to 2V and -3V respectively What is the voltage drop across the device? So I think I just go A-B , but it might also be B-A so either 5 or -5. im not ...

**math [last]**

m= 1/2 and y-intercept is 7. so x= 1/2x + 7

**math [last]**

Write the equation of the line with the given slope and y-intercept. slope = 1/2 y-intercept = 7 A)y = 7x + 1/2 <-- or is it C? B)y = 1/2x + 7 C)x = 7y + 1/2 D)x = 1/2y + 7

**math**

no wait is 2x+4.

**math**

@bobpursley thanks. @Damon so the 2nd one is B, and for the first one its B. -2x + 4

**math**

A line crosses the y-axis at (0,4) and has a slope of -2. Find an equation for the this line. A) y = 2x + 4 B) y = -2x + 4 C) y = -2x - 4 D) y = -4x + 2 <-- 6)Write the equation of the line with the given slope and y-intercept. slope = 5 y-intercept = 8 A) y = 5x + 8 B) x...

**math**

Thank you, I'm so not good at this.

**math**

A line has a slope of 1/2 and passes through the point (0,5). What is the equation of the line? A) y = 1/2x + 5 B) y = 1/2x - 5 C) y = 5x + 1/2 D) y = -5x + 1/2 How do i figure this out? is it D?

**Math**

D. I'm sorry Im new to this math and its so hard.

**Math**

A line passes through the point (0, 5) and has a slope of -1/2. Which is the equation of the line in slope-intercept form? A) 2x + y = 7 B) y = 3x + 5 C) y = -2x + 7 D) y = -1/2 x + 5 B?

**physics**

A homogeneous rod AB=100 cm of mass m=4kg is suspended from a fixed roof by means of two very light strings OA and O'C having the same length point C is at 20cm from B , rod AB is in a horizontal position of equilibrium Make the inventory of the forces acting on the rod AB.

**English Grammar**

Hi, I'm writing an English essay and I was wondering which sentence is grammatically correct. 1)The individual rights to speak are taken from John and Mary or 2) The individual's right to speak are taken from John and Mary

**Statistics**

The coefficient of correlation between the age and blood pressure of a sample of 8 persons was found to be +0.8, the average age is 50 years and average blood pressure is 60. Their standard deviations were 5 and 10 respectively. a) Obtain the two regression equations b) find ...

**Science - Chemistry**

If vapour pressure of water is 17.5 torr at 20C, what is the water vapour pressure inside a bottle of 100 proof whiskey? 100 proof = 50% ethanol Total volume = 1 L Mass of ethanol = 394.5g Mass of water = 500g Density of ethanol = 0.789g/mL Moles of ethanol = 8.58 mol Moles of...

**science,physics**

i do not understand this question and by the way this is not my homework. Reggie sets out from home on his bicycle.First he goes to the shop, which is 500 m away, he then rides to his friend's house which is a further 1200m.He then returns home. what total distance has ...

**Math**

Jake ate 3/8 of a pizza and spent $4.00 on french fries .Bill ate the other 5/8 of a pizza and spent $1.50 on a drink. Their bills were equal. How much did the whole pizza cost?

**physics**

A skier (m=55.0 kg) starts sliding down from the top of a ski jump with negligible friction and takes off horizontally. If h = 4.90 m and D = 10.6 m, find H.

**central middle**

In September, the ratio of the amount Ray spent and the amount he saved was 4:1. In October, he got a salary raise. He increased his spending by 25% but save the same amount. Find the new ratio. Is it 5:1?

**physics**

A 48-kg girl stands on a 8-kg wagon holding two 19.5-kg weights. She throws the weights horizontally off the back of the wagon at a speed of 9.0 m/s relative to herself. Assuming that the wagon was at rest initially, what is the speed with which the girl will move after she ...

**Social Studies**

During the late 1900's a global economy developed as foreign trade and multinational corporation grew?

**Social Studies**

JUST HELP ME!! YOUR A TEACHER FOR GOD'S SAKE!!

**Social Studies**

WHAT DO YOU MEAN?????

**Social Studies**

I NEED HELP!!!!!! During the late 1900's a global economy developed as foreign trade and multinational corporation grew? PLEASE IM BEGGING FOR HELP!!!! DESPERATE FOR HELP!!!!!

**precalculus**

Thanks Steve!

**precalculus**

A farmer needs to build a rectangular pen that is 800 square feet and has two bays. What equation can he use to minimize the cost of the fence and what are the dimensions of the pen?

**help fast fast**

What was the correct answer?

**Chemistry**

In which of the following substances does sharing of electrons between two atoms occur? He Nal PO43– Ag

**Chemistry**

Which of the following elements is least likely to form a cation that will then form an ionic bond with an ion of a Group 7A element? S K Rb Fr

**Chemistry**

Which of the following is a bond in which a metal transfers one or more electrons to a nonmetal? ionic bond hydrogen bond metallic bond covalent bond

**Chemistry**

The ionization energies (kJ/mol) of hydrogen (H), nitrogen (N), sodium (Na), and oxygen (O) are 1,312, 1,402, 1,681, and 1,314, respectively. Which element combination is least likely? OH– NO3– NH4+ NaO–

**Chemistry**

Which of the following is a monatomic cation? Br NH4+ SO42– Fr+

**Chemistry**

Which of the following elements is most likely to form an ion that will then form an ionic bond with an ion of a Group 1A element? Pt I Fr Be

**mechanics**

The angled beam ABC in the figure is composed of segments AB and BC joined at B at a 90˚ angle. Both segments have length L and uniform section stiffness EI. The beam is fixed at C and loaded by a downward concentrated force, P, applied at its free end A. You will use ...

**mechanics**

Beam ABC in the figure is composed of segment AB of length L and uniform section stiffness EI joined to segment BC of length L and uniform section stiffness 2EI. The beam is fixed at C (x=2L) and loaded by a downward concentrated force, P, applied at its free end A (x=0). You ...

**chemistry**

When a 10 g sample of copper oxide is reduced by heating in the presence of carbon monoxide, how many moles of copper are formed?

**English**

I have to write a compare and contrast essay on "the pedestrian ,"the murderer" , and "there will come soft rains" - I need help choosing 3 things to compare in each story

**Chemistry**

What properties do metalloids display, and where are metalloids found on the periodic table?

**Chemistry**

Why did Mendeleev leave gaps in his early periodic table, and what was the ultimate importance of the gaps?

**Physics**

The following calculations are for EM radiation, for which the internal energy U=Vu, where u=u(T)is the total energy density. a) Show that (∂S/∂T)_v=V/T(du/dT), and (∂S/∂V)T=(u+P)/T Note: use the answers in part a in part b and c b) Using Stefan-...

**Physics**

The following calculations are for EM radiation, for which the internal energy U=Vu, where u=u(T)is the total energy density. a) Show that (∂S/∂T)_v=V/T(du/dT), and and (∂S/∂V)T=(u+P)/T Note: use the answers in part a in part b and c b) Using Stefan-...

**Physics**

The following calculations are for EM radiation, for which the internal energy U=Vu, where u=u(T)is the total energy density. a) Show that (∂S/∂T)_v=V/T(du/dT), and and (∂S/∂V)T=(u+P)/T Note: use the answers in part a in part b and c b) Using Stefan-...

**Geometry**

The measure of each interior angle in a regular hexagon is?

**AP Human Geography**

1. What role does migration play in the geographic pattern? 2. How about interaction & isolation after migration takes place? 3. When do dialects begin to become so different that they may be viewed as a different language? 4. How has the Internet contributed to the ...

**Science**

Tellurium is a metalloid. How many valence electrons does tellurium have? 3 4 5 6

**Science**

Which of the following shows three elements in order of increasing conductivity? Ge, O, Mn O, Ge, Mn Mn, O, Ge Mn, Ge, O

**Science**

Inner transition metals are composed of which of the following? metals lanthanides and actinides halogens noble gases

**Science**

Which of the following is a characteristic of nonmetals? Nonmetals are often brittle solids. Nonmetals are often malleable. Nonmetals often conduct electricity. Nonmetals are often ductile.