# Posts by Marissa

Total # Posts: 319

**math**

a pentagon is a polygon with 5 sides

**Math**

i need an example problem using log10E=11.4+1.5m when E means radiated energy and m is means magnitude. the log has a base of 10 that's why the 10 is there. please help!!! Again, need an example problem relating it to earthquakes

**Math**

A bicycle trail is 7miles and 880 yards long.How many total yards is the bicycle trail

**CHEMISTRY HELP PLEASE!!**

@DrBob222 so, for the first part I do, Ksp = (Mg^2+)(OH^-)^2 , which is 1.8x 10^-11 = (.0286)(OH)^2 for OH-, i get 2.51 x 10^-5 then, for the second part, I do, Kb = (NH4^+)(OH^-)/(NH3), which is 1.8x 10^-11 = (NH4)(2.51 x10^-5)/(.114) for NH4, i got 8.17x10^-8 mol then I ...

**CHEMISTRY HELP PLEASE!!**

0.350L of 0.160 M NH3 is added 0.140 L of 0.100 M MgCl2 . How many grams of (NH4)2SO4 should be present to prevent precipitation of Mg(OH)2 (aq) ? The Ksp of Mg(OH)2 is 1.8 x 10–11.

**math**

115

**math**

$84.00

**Math**

b.

**physics**

At the moment car A is starting from rest and accelerating at 5.0 m/s2, car B passes it moving at a constant speed of 45m/s. How long will it take car A to catch up with car B?

**Chemistry**

1.49 M

**math**

There are 5 yellow cards, 4 red cards, and 1 purple card. He draws a card at random, replaces it, and draws a second card. What is the probability that both cards will be red?

**SS8R - paragraph help!**

I think it good.

**math**

I am not sure but I think it is 50,400 dollars a week. 60 minutes in one hour 24 hours in one day 7 days in week (5x60)=300 300x24= 7200 7200x7=50,400

**Maths**

x+2x+3x=180 add them. 6x=180 divide 180/6= 30

**spanish**

dark haired/skinned

**Health**

Gonorrhea is spread through contact with the ________. A. Anus, Penis, Mouth, Skin B. Penis, Anus, Mouth, Vagina C. Vagina, Skin, Penis, Anus D. Mouth, Penis, Vagina, Fingers I think it's B?

**p.e.**

a scull is to rowing as a -------- is to yachting.

**Calculus**

Assuming that f and g are functions differentiable at a (though we do not know their formulas). Prove that f +g is differentiable at a using the definition of the derivative.

**Physics**

A dog running in the +y-direction at 6.0 hears its owner call from behind, and 2.7 later it's running at the same speed in the opposite direction. Calculate the dog's change in velocity. Calculate the average acceleration

**Calculus**

F(x)=|x-5| evaluate the following limits lim x->5- ( f(x)-f(5))/(x-5) lim x->5+ ( f(x)-f(5))/(x-5)

**physics**

A wire tooth brace used by orthodontists. The top-most tooth is protruding slightly, and the tension in the wire exerts two forces at 16 º angle on this tooth in order to bring it back into alignment. If the forces have the same magnitude of 19.5 N, what is the magnitude ...

**physics**

A 316-kg boat is sailing 12.0° north of east at a speed of 1.60 m/s. 39.0 s later, it is sailing 36.0° north of east at a speed of 4.00 m/s. During this time, three forces act on the boat: a 31.4-N force directed 12.0° north of east (due to an auxiliary engine), a ...

**Physics**

Two arrows are shot vertically upward. The second arrow is shot after the first one, but while the first is still on its way up. The initial speeds are such that both arrows reach their maximum heights at the same instant, although these heights are different. Suppose that the...

**Health**

I believe the correct answer is C. increase;reduce?

**Health**

I put D down and got it wrong.

**Physics**

A rock is dropped from a sea cliff and the sound of it striking the ocean is heard 3.9 s later. If the speed of sound is 340 m/s, how high is the cliff? i know you use the equation y=(initial velocity)(time) + (1/2)(acceleration)(time^2) but I'm having problems putting all...

**Science**

What happens to approximately 60% of the energy released during the complete oxidation of glucose? A) It is used to synthesize more ATP. B) It is reused to supply the energy for anabolic reactions. C) It is stored in the body as fat. D) It is lost by the body in the form of heat

**science**

In a micelle, why do you find the fatty acid chains of the of the phospholipid molecule are on the inside of the bilayer?

**vulindlela**

I believe that the correct answer is B. Physical activity.

**Calculus**

How do you use imlicit differentiation to differentiate e^(xy)? I have the problem "use implicit differentiation to find dy/dx. e^(xy)+ x^2 - y^2 = 10. I've gotten to the point whereI have d/dx(e^(xy)) + 2x - 2ydy/dx = 0, but I can't go any further because I don&#...

**Calculus I**

Okay, thanks guys!

**Calculus I**

Find the derivative of y=ln((1+e^x)/(1-e^x)) I know that the derivative of y=ln(1+e^x) would be (e^x)/(1+e^x), but I'm not sure what to do with the 1-e^x on the bottom here. Can someone help please? Thanks!

**Chemistry help PLEASE!!!**

The solubility of AgCl(s) in water at 25 C is 1.33x10^-5 M and its deltaH of solution is 65.7 kJ/mol . What is its solubility at 60.1 C ? Please explain how to solve for this!!

**fourth grade math**

if two dice are rolled together,which outcome is more likely-dots totaling 12 or dots totaling 7? explain you anser.

**Math**

Delia works from 8:00 a.m. to 4:30 p.m. and has one hour each day for lunch. How much does she earn for a five-day workweek at $4.80 per hour?

**social studies**

Were cassette tapes famous when they first came out?

**math**

Just pick 3 mid sized cars.

**algebra 2**

The answer is y=2x+7. First put it in point slope form then solve it into slope-intercept form. Use the same slope because having parallel lines means the same slope.

**biology**

A dominant gene A produces wire-haired texture in dogs. Its recessive aamllele a produced smooth hair. Cross the heterozygous wire-haired dog with homozygous smooth-haired dog. List the genotype and phenotype ratios of all the possible offspring.

**Geometry**

the answer to this queston is acute! :)

**physics**

A small cart weighs 15.0 N. If a constant force of 25 N is used to move the cart horizontally across the desk, A] What will be the acceleration of the cart? B]How far will the car move in 1.0 second

**Physics Help Please**

Issac has to do 1000J of work on a 5kg box, and all the work he did simply went into lifting it above the ground. How high above the ground will the box be when all the work has been done?

**physics**

a football punter accelerates from rest to a speed of 8 m/s during the time in which his toe is in contact with the ball (about 0.21 s). If the football has a mass of 0.50 kg, what average force does the punter exert on the ball?

**physics**

a bag of sugar weighs 5.00 lb on earth. What would it weigh in newton on the moon, where the free fall is one-sixth that of the earth?

**physics**

a 8.0 kg object undergoes an acceleration of 2.2 m/s squared.what is the resulting force acting on it?

**physics**

a football punter accelerates a football from rest to a speed of 7 m/s during the time in which his toe is in contact with the ball (about 0.18 s). If the football has a mass of 0.50 kg, what average force does the punter exert on the ball?

**physics**

While exploring a cave, a spelunker starts at the entrance and moves the following distances: 75.0 m north, 225 m east, 160 m at an angle 30.0° north of east, and 150 m south. Find the resultant displacement from the cave entrance.

**nursing**

What are ways you provide education to patients in your work place regarding chromic diseases?

**Nutrion**

What types of pathogens? What habits in your food preparation practices do you think might cause these pathogens to grow? What habits can you change in your life to reduce your risk of foodbourne illness?

**nutrition**

Review the nutrition quality of the items, using what you know about daily values, and ingredients (one of the products must have a health claim). Write a 300-500 word essay on what you have learned.

**nursing**

List three key staff of a public health department other than the community or public health nurse.

**Math**

The GCf of my numerator and denominator is 3. I am equivalent to 2/5

**Spanish-8th grade**

This is in regard to my earlier post about the conversation- Thank you for all your help.Thank you for your patience too Could you recheck this? I don't understand about who talks much-my number 10 but I think you put it at #9You said it was the brother not the person but ...

**Spanish -Sra Please recheck**

Thank you for all your help.Thank you for your patience too Could you recheck this? I don't understand about who talks much-my number 10 but I think you put it at #9You said it was the brother not the person but I'm confused why it states me and then habla-doesn't...

**Spanish 8th grade**

I have to read this and answer these questions for homeowrk-I'm not sure if I did this correctly. Could you please check-I put the reading and then questions and my answers under it-thank uyou for checking-I'm really not sure about my answers-I'm a little confused ...

**Spanish-8th grade**

We're learning direct object pronouns so I had to replace the "sellos" in the first sentence-did I do it correctly? Tú coleccionas sellos. Tú los coleccionas.

**math**

What is the standard notation for 3 to the 3rd power

**algebra**

simplify 14a^8y^3-7a^4y^5+28a^12y^2/7a^4y

**Math-Calc**

The lim as x goes to 0- for cos(x)/sin(x). I know the answer is negative infinity but I don't really understand why.

**Calculus**

A rectangle is inscribed with its base on the x axis and its upper corners on the parabola y= 12 - x^2. What are the dimensions of such a rectangle with the greatest possible area?

**Science**

I'm in 6th grade and I need help for my science project. I don't even know what to do. Any fun science projects for 6th graders?

**lit**

is this sentence punctuated correctly ?My grandfather's favorite quotation is E.E. Cummings's, "The most wasted of all days is one without laughter."

**physics**

Two charges are separated by a distance d = 5 m. The charge q1 has a charge of q1= 7.0 µC (microcoulombs) and q2 has a charge of q2= 6.8 µC. What is the force between the charges?

**accounting**

8000

**Math- Calculus**

Let f be a function such that f(-1)=3 and f'(-1)=6 let h(x)=x^5f(x) evaluate h'(x) at x=-1

**math**

If the true population standard deviation was known to be 3.0, then approximately what minimum sample size would you need in a simple random sample if you want a 95% confidence interval for the mean to have a margin of error of .5 or less?

**math**

Find a polynomial f(x) with leading coefficient 1 and having the given degree and zeros. Each polynomial should be expanded from factored form, simplified and written in descending order of exponents on the variable. For example: (x+5)(x-2) should be given as the answer x^2 + ...

**algebra**

if the discriminant of (5u^2)+bu+2=0 is 41, what are all the values of b

**6th grade Math**

Thank you!

**6th grade Math**

9 + 5k = 45 + 2K the sample shows operation S9 to come up with 5K=36+2k assuming subtract 9 from the 45 sample shows K=12 how did they come up with that?

**geometry**

Find the area of a rectangle that has one side measuring 10 cm. and a diagonal measuring 26 cm.

**Physics- Exercise 10**

A 500kg pig is standing at the top of a muddy hill on a rainy day. the hill is 100.0m long with a vertical drop of 30.0m. the pig slips and begins to slidedown the hill. What is the pig's speed at the bottom of the hill? Use the Law of conservation of Energy.

**Physics**

while on the moon, the Apollo astronauts enjoyed the effect of a gravity much smaller than that on earth. if Neil Armstrong jumped up on the moon with an initial speed of 1.51 m/s to a height of 0.700m, what amount of gravitational acceleration did he experience?

**Chemistry**

I'm sorry I'm just really confused by ionization energies and the heat of formation. Could you explain how to set up this problem? Use the data (kJ) for ionization energies, electron affinities and heats of formation to find the lattice energy of Fe3O2(s) according to ...

**English**

The forth one is correct and that is it. The other examples are extremely grammatically incorrect.

**Algebra1**

How would i get the problem to become 3x+5x=17+7...do i add like terms?

**Algebra1**

0.32

**Algebra1**

2x-7+x=11-5x+6

**11th grade**

a rock is dropped from a 20.0m bridge falls into the river below. a.)at whqat velocity does it strike the water? b.)how much time did the rock take to reach the water?

**physics**

when Chris slams a basketball he has a vertical leap of 1.46 meters. what must his initial vertical velocity be in order for him to reach this height?

**6th grade**

Thank you very much for your help. I had the same answer. I'm trying to explain the reciprocal to my daughter, she is worried that her teacher will say the answer is wrong.

**6th grade**

Isn't this a division problem? I have to divide 1-1/2 into two parts.

**6th grade**

I was told that when dividing a mixed number you write the reciprocal of the second number and then multiply and that will change the answer.

**6th grade**

What steps do we use to change 1-1/2 cups in half?

**Chemistry**

What is the ionization energy (in kJ/mole) of the hydrogen-like ion F8+ ?

**Math**

estimate a 15% tip on a $42.65 check

**Math**

yes

**Algebra**

Write the equation of the prpendicular bisector of the line segment AB with endpoints A(1,1) and B(7,5). Write the answer in slope-intercept form.

**math**

Write the equation of the perpendicular bisector of the line segment AB with endpoints A(1,1) and B(7,5). Write your answer in slope intercept form.

**economics**

Can you help me describe National Debt in 2 paragraphs?

**Chemistry**

Based on the balanced equation, C2H4 + 3O2 → 2CO2 + 2H2O calculate the molecules of H2O formed when 135 molecules of O2 are reacted.

**Chemistry**

three different liquids are used in a manometer. (a) derive an expression for P1-P2 in terms of ro(a), ro(b), ro(c), h1, and h2 (b) suppose fluid A is methanol, B is water, and C is a manometer fluid with a specific gravity of 1.37; pressure P2=121.0 kPa; h1=24.0 cm. Calculate...

**Social studies**

What were the economic, political, and social aspects of New Netherland, New Spain and New France?

**math**

A department contains 12 men and 17 women. How many ways are there to form a committee with 6 members if it must have strictly more women than men? It is strongly recommended that you do this on paper! how do i solve this in the calculator?

**Physical chemistry**

100g of water at 30.0C is mixed with 150g of water at 85.0C. What is the final temperature of th mixture assuming no heat is gained or lost during the mixing process?

**Physics Please Help**

convert grams into kilo grams: 95/1000 = .095 kg x = sqrt MV^2/k x = sqrt .095(3.4)^2/70 x = .12525 x = .13 m x = 13 cm

**College Chemistry**

Balance this equations for redox reactions in basic solution. Fe(OH)3(s) + OCl- ¨ FeO42- + Cl-

**college**

Pretend the program in Senegal had been reducing infant mortality at a rate of 11 % per year. How long would it take for infant mortality to be reduced by 39 %?

**math**

write the multiplication/division fact family for 2, 7, and 14.

**physics**

heather and Matthew walk with an average velocity of .89 m/s eastward. it takes them 44 min to walk to the store. what is their displacement?