# Posts by Maria

Total # Posts: 2,019

**Statistics**

In your biology class, your final grade is based on several things: a lab score, scores on two major tests, and your score on the final exam. There are 100 points available for each score. However, the lab score is worth 15% of your total grade, each major test is worth 22.5...

**Chemistry**

CH4(g) + 2O2(g) = CO2(g) + 2H20(g). What volume of O2 is required to react with 2.0 mol CH4 at 50 degrees Celsius and .500 atm?

**math**

how do i solve -9(w-3)=8w-7?

**Algebra**

Thank you

**Algebra**

Tell whether the equation is a function: 1) y = x-3 ; 2) y = -3/4x ; 3) x = -11 ; 4) x = 8 ; 5) y = 2(x+1)

**physics**

0.671

**math**

what is 2 tens from 3 tens?

**Math**

I don't care losers

**Math (probability)**

Three members of a 12 person singing group are going to be chosen to sing a song in their coming concert. A) how many different groups containing 3 people can be chosen from the 12 members of the singing group? B) what Is the probability that mike and Jo will both be in the ...

**Math**

2. Three members of a 12 person singing group are going to be chosen to sing a song in their coming concert. A) how many different groups containing 3 people can be chosen from the 12 members of the singing group? B) what Is the probability that mike and Jo will both be in the...

**Chemistry**

What is the mole fraction of solute in a 3.26 m aqueous solution?

**chemistry**

What mass of lead (II)chloride would precipitate if a solution containing 8,28 g of lead (II) ions(Pb2+) reacts with excess HCl?

**Physics HELP!!**

Two iron spheres each have a volume of 10 cm^3 and a mass of 78g. How many electrons must be placed on each sphere so that the electrostatic force of repulsion between them just balances the force of gravitational attraction? Assume the distance between the spheres is more ...

**Earlychilodhood education**

B. "I don't really know, Karen."

**Chemistry - Biology**

Explain why glucose is improtant to humans ? Ans:Glucose is important to the body cecause it helps the reporduction of cells, coposition of proteins and nucleic acids foundin all cells. It helps growth and repairs tissues . Is that correct??

**Math**

During swim lessons,the teacher passed out 23 pairs of goggles. there are 10 pairs left. how many pairs of goggles did the teacher have at the start?

**Government**

Monetary policy differs from fiscal policy in that a. it has to be exercised by the legislature. b. the policy goals are very different. c. it is a slower process than fiscal policy. d. it is a faster process than fiscal policy. e. none of these answers are correct.

**english**

Identify the type of subordinate clause in the following sentence. If we remember to brush our teeth, we will get fewer cavities. a)noun b)adjective c)adverb

**English**

Identify the type of subordinate clause in the following sentence. The guy who ran out of the clinic is running late. a)noun b)adjective c)adverb

**math**

how do you simplify 15 over 27 ?

**personal statement**

i need to write personal statement using Common App. Option 3: Indicate a person who had had a significant influence on you, and describe that influence. I do not know how to organised the paragraph and how could I add more to essay and what to end please. MY DEADLINE IS COMING.

**colllege algebra**

use synthetic division to factor x^3-2x^2-9x+18

**college algebra**

let f(x) be polynomial function. explain how to use the factor theorem to check if x) is a factor of F(x)

**ap calculus**

How is the ap calculus AB and BC test? Is there any online practice test?

**Chemistry**

The relationship between ionization energies as evidence for electron configuration for elements?

**CHEMISTRY**

FOR MOST LABS THAT WE PERFORM , THE MEASURED WALUES ARE ALWAYS COMPARED TO THE ACCEPTED VALUES USUALLY IN THE FORM OF PERCANT ERROR . WHY IS THIS DONE?

**Chemistry**

What trends the atomic radii of group 2A ?what trends the atomic radii of period 3? Why this trend occurs? Ans Atomic radii of group 2A increases . Atomic radii of period 3 decreases . I don't know how to answer the last question!! Please help me !

**Chemistry**

What trends the atomic radii of group 2A ?what trends the atomic radii of period 3? Why this trend occurs? Ans Atomic radii of group 2A increases . Atomic radii of period 3 decreases . I don't know how to answer the last question!! Please help me !

**chemistry**

Wat is the volume of a 200g object that has the. Density of 1.27L?

**chemistry**

Wat is the volume of a 200g object that has the. Density of 1.27L?

**math hurry please**

so 3c + 5a=115 and a+c=33 so if we plug in then 3*8 is 24 and 5*25 is 125 so that doent work so i just go on from their! Thanks

**math hurry please**

Each child ticket for a ride costs $3, while each adult ticket costs $5. If the ride collected a total of $115, and 33 tickets were sold, how many of each type of ticket were sold? A. 8 child and 25 adult B. 17 child and 16 adult C. 156 child and 41 adult D. 25 child and 8 adult

**Msth**

C C D A C 100% trust me even look it up on math papa

**Chemistry**

n artifact was found and tested for its carbon-14 content. If 83% of the original carbon-14 was still present, what is its probable age (to the nearest 100 years)? (Carbon-14 has a half-life of 5,730 years.) yr

**Math**

Find two numbers the exact answer is between 6x7,381

**english**

thnks

**english**

how about for Germany

**english**

college graduation rates in USA and education statistics.

**Physical Education**

What is the average weight for 8th grade girls?

**chemistry**

How many grams of sodium hydroxide is needed to react with 100 ml of a 1.4 M nitric acid for complete neutralization to happen.

**english**

thnks

**english**

what else can we say?

**english**

i have to write an essay on why should we have freee colllege education improvement in U.S.A. Why it is problem. Can u please give the reason.

**INTRODUCTION TO COMPUTERS**

control a pointer on the screen

**Chemistry**

Which ion has larger radius O2- or F 1-?why?

**Math**

You pick two cards from a deck of 52 cards. Find the probability that the first card was a spade given that the second card was a spade.

**chemistry**

what is evidence of exothermic rection?

**trigonometry**

Been trying this forever so it says: Simplify 1+sin2x+cos2x/1+sin2x-cos2x ive tried this problem so many times I need help with it...

**Chemistry**

Fool's gold is not gold at all but only lead IV sulfide. If you have 751.0 grams of lead how many grams of fool's gold can you make? Ans: Pb+2S->PbS2 Given * (1/amu of given) * (mol of find/mol of given) * (amu of find/1mol)

**movement and music**

Two important factors to consider when making a music selection are variety and a. quantity b. quality c. mood d. rhythm

**chemistry**

the specific heat capacity of iron metal is 0.450 j/gk. how many joules of energy are needed to warm 1.31 g of iron from 20.00 C to 29.00 C?

**ap chemistry**

A 2.5 g of sample megnesium carbide is added to 8.8 ml of water inside calorimeter of 700 ml of water how do we find limiting reactant

**physics**

ok. thank u

**physics**

but it is in hertz

**physics**

find energy of a single photon of light when you have 5.4*10^12 hertz.

**algebra**

the time it takes you to get to campus varies inveresly as your driving rate. Driving at a rate of 40 miles per hour, it takes 1.5 hours. How ong would the trip take you driving at a rate of 60 miles per hour?

**algebra 1**

a number decreased by -4 is at least 9

**Physical science**

Which is not an example of acceleration? a) A person jogging at 3m/s along a winding path b) A car stopped at stop sign c) A cheetah running 27m/s east d) A plane taking off

**chem (measurements & dimensional analysis)**

the density of regular gasoline is 0.9854 g/cm3. What is the density in lbs/gal

**Anthropology**

Caste systems are most common in societies: (Points : 1) that were previously ranked. that have a tradition of slavery. that have a great deal of occupational specialization. that have monetary systems.

**General Chemistry**

Hospital X-ray generators emit X rays with wavelength of about 15.0 nanometers (nm), where 1 nm=10-9m. What is the energy of a photon in an X ray?

**math**

how do i calculate these ratios 5,474 to 1,850 but the total is 7,324 do i need to do anything with the total or is it right??????

**Math**

I got it! I love this site already!

**Math**

How long will it take a car traveling 65 mph to pass a car traveling 45 mph if the slower car had a 2 hour lead?

**Chemistry**

a compound decomposes with half life of 8seconds and is independent of concentration.how much time is consumed to convert the concentration of one sixteenth of its initial concentration?

**Math**

A fire hose has a circular cross-section which has a diameter of 20 cm. The hose is full of water and the water in the hose is flowing at a speed of 5m/s. How many liters of water can flow from the hose in 1 minute? (1m^3 = 1000 L)

**Cultural Anthropology**

The difference between transhumance and nomadic pastoralism is: (Points : 1) in transhumance people grow food and in nomadic pastoralism any domesticated plant food is acquired through trade. different types of animals are herded. in transhumance women do the dairying and in ...

**math**

the 30-pack of blank cds

**Thank you**

Thank you can you tell me why no one can help with my real question about ratios. I have submitted it twice now, it really has me confused and I don't know what to do. Please help me

**Math**

I think maybe this is a hoax, I listed same problem that I am having twice and no one can answer it? It is in my eitgth grade class. Let's see if this is for real what is 2+2?

**Science math**

Can no one help me? I posted a question earlier I don't need answer I need to understand what I did wrong my thinking is that if I have a 2:1 ratio And my total is 99 that if I divide by 3 then I can get the amounts 33x2 is 66, then 33x1 is 33 so it would be 66:33. I used ...

**Science-math**

The equation for the decomposition of silver oxide is 2(Ag2)o yields 4Ag +o2. Set up ratio to calculate the number of oxygen molecules released when 1 gram of silver oxide is broken down. There are 2.6 x 10 to 21 power molecules in 1 gram of silver oxide. I know that it is a 2...

**History**

Compare the Iroquois form of government to that of the United State?

**health**

Resistance exercises improve muscular strength in person with such condition as A-Multiple sclerosis B- Cerebal palsy and spinal cord injuries C-Cognitive disability D-All above

**chemistry ............chemistry**

if you had to design a firework show for a Christmas celebration , what elements would you include in the fireworks ? why ? I knew u post answer for me , but i can't find it . May you answer for me? Thank you so much !!

**chemistry ......chemistry**

what does Planck mean when he states that energy in quantized? Ans: plank's theory proposes that the energies absorbed or emitted by atoms are quantized ,which means that their values are restricted to certain quantities. is this O.K?

**chemistry ........................chemistry**

thank you

**chemistry ........................chemistry**

Sodium Na+ Intense yellow Barium Ba++ Green Calcium Ca++ Brick red Copper Cu+ or Cu++ Blue-green Strontium Sr++ ? Lithium Li+ ? Sodium and potassium mixture Na+&K :yellow light Observations using the cobalt glass filter Sodium & potassium mixture Na+&K+:reddish color Potassium...

**social studies**

when many native americans died from a disease called smallpox?

**chemistry ................chemistry**

yes , i did . but i don't sure . thank you

**chemistry ................chemistry**

what is the color a mixture of sodium and potassium compounds?? What is the color a mixture of sodium and potassium compounds (use the cobalt glass)??

**physical sicence**

If a force gives a 2-kg object an acceleration of 1.6 m/s2, what acceleration does this same force give to an 8-kg object?

**chemistry .............chemistry**

what color emission would you see if you heated each solution to an extremely high temperature? why

**chemistry.......chemistry**

what color did your glass-stirring rod emit ? what does this indicate about your glass-stirring rod?

**physics**

If a force gives a 2-kg object an acceleration of 1.6 m/s2, what acceleration does this same force give to an 8-kg object?

**chemistry .....chemistry**

what element include in the fireworks power ? why

**chemistry -------------chemistry**

If a flame on the candle burns red , how does energy of that flame compare to that of the Bunsen burner flame ? and why ? ans:The Bunsen burner flame has higher temperature than candle’s flame . Because flame of candle emit red ,and red has the least energy in visible light.

**chemistry ---------chemistry**

What color did your glass -stirring rod emid ? what does this indicate about glass- strirring rod ? Ans: galss stirring rod emids orange . but i don't know the ans 2 .

**chemistry ------------ chemistry -------**

when you were heating milk on the stoven you accidentally spilled some milk on the burner . what color would you see ? why would you see that color? My answer : Intense yellow . because milk has sodium , sodium is intense yellow . is this right ?

**chemistry ------ flame test-------------**

thanks for your help

**chemistry ------ flame test-------------**

Did the nitrate ion effect the color emission of the solution ? how did you decide ? my answer: No , because The nitrate ion is the oxidizing agent in the compound without it you could not burn the chemicals and you could not produce a spectrum so there would be no emission ...

**Maria**

All of them

**Science**

Biphenyl, C12H10, is a nonvolatile, nonionizing solute that is soluble in benzene, C6H6. At 25 °C, the vapor pressure of pure benzene is 100.84 torr. What is the vapor pressure of a solution made from dissolving 15.2 g of biphenyl in 29.5 g of benzene?

**Computer studies**

Draw a flowchart for a program that will accepts 30 intergers and print the number of positive and negatives numbers and the sum of the positive number

**physics**

A spring has a length of 60cm when it unstretched. A load of 10N increases its length to 64 cm and a load of 20N increases its length to 68cm a)what extension is produced by the 20N load? b) What length would the spring have if a load of 15N were added to it? c) Determine the ...

**history**

One of today's hot political topics is some states' measures to restrict voting. What historical precedents do we have for such efforts, in the South and elsewhere? Why were/are some people concerned about this?

**physical science**

A Weather balloon carries instruments that measure temperature, pressure, and humidity as it rises through the atmosphere. Suppose such a balloon has a volume of 1.2 m3 at sea level where the pressure is 1 atm and the temperature is 20oC. When the balloon is at an altitude of ...

**Physics**

A loaded truck can accelerate at 4 m/s 2. It loses its load so that it is only 0.1 as massive. By what factor must the acceleration change for the same driving force?

**Algebra 2**

x=4? y=100? Is That Right?

**Algebra 2**

Explain what the notation f(4)=100 means? We could also say that when x=___, y=___?