# Posts by Holly

Total # Posts: 452

**physics**

A box weighing 890N is pulled along a horizontal surface by means of a string which is at 30o above the horizontal. If the coefficient of kinetic friction is 0.2 and the box is accelerated at 0.8 m/s2, what is the tension in the string

**Math **

Find the values of the variables. [-12 -w^2] = [2k -81 2f 3 -14 3 Please help me. I don't know how to do this at all, and can you show your work so I can understand better. Thanks

**science**

how does a grassland follow conservation of mass

**social studies**

LoCo10 that was unnecessary, get a life

**Maths**

There are 40 children on a bus, there are 12 more boys than girls, how many girls are there on the bus?

**programing**

create an algorithm, flowchart, and pseudocode for a solution of the following problem. This solution will include the use of arrays needed to complete all parts of the logic. You have requested to develop a program that will record and process the rainfall totals of a 12 ...

**computer science**

create an algorithm, owchart, and pseudocode for a solution of the following problem. This solution will include the use of arrays needed to complete all parts of the logic. You have requested to develop a program that will record and process the rainfall totals of a 12 month...

**physics**

a bird flies 3km west and then 4km south. find the resultant displacement of the bird

**physics**

a cyclist travels 2.5km east, then 10km south and finally 5km west. determine the cyclist's overall displacement from their starting point.

**chemistry **

1. based on the equation below, how many liters of water can be produced from 8.5 L (assume that hydrogen is in excess) 2H2(g)+O2(g) --->2H2O(g)

**School**

Who is Jean Kessner?

**Physics**

A catapult of a spring constant 100N/M contains 2.0J of elastic potential energy when it is pulled back. What is the extension of the rubber band? I know that E= F/K but I don't know how to work out the force from the information provided, help would be much appreciated, ...

**Genetics**

there is not enough information to make a prediction

**Physics**

A particle moving at a velocity of 4.8 m/s in the positive x direction is given an acceleration of 3.4 m/s2 in the positive y direction for 4.4 s. What is the ﬁnal speed of the particle? Answer in units of m/s.

**Math**

Let f(x) be a cubic polynomial function such that y=13(x-1)+4 is tangent to the graph of f(x)at (1, 4) and y=(x+1)+6 is tangent to the graph of f(x) at (-1, 6). Find the equation of f(x)

**math**

each letter in the following problems represents a different number 0 + 9. letters remain constant witin the problems. can you figue out what number each letter represes? he + me = we

**English**

What are the subject verb and object of this sentence. Paralegal must have good ethics.

**Maths**

Q) ABC is an isoceles triangle in which a=150cm, b=c= 249cm. Find the size of each angle of the triangle, correct to the nearest minute. I have drawn a triangle but don't know where to proceed from here? ty in adv.

**Chemistry**

The H's above and below are suposed to be single bonded to the C's

**Chemistry**

Identify the compound and classify its functional group in the image H H H H H H H-C-C-C-O-C-C-C-H H H H H H H

**Chemistry**

What is the oxidation number for each atom in NH4F? N=+3, H=-4, F=+1 N=-3, H=+1, F=-1*** N=+3, H+1, F=-1 N=-3, H=-1, F=+1

**Chemistry**

so it's K?

**Chemistry**

What is the reducing agent in the following reaction? 2K + S - - > K2S K S*** K2S None of the above

**Chemistry**

In the reaction of beryllium with fluorine, which atom is oxidized? fluorine beryllium*** neither of them both of them

**Chemistry**

Then would it be electrons?

**Chemistry**

What are transferred in an oxidation-reduction reaction? atoms*** electrons ions protons

**Chemistry**

Iron metal is formed during the reduction of iron(III) oxide: Fe2O3 + 3CO 2Fe + 3CO2 When 29.7 kg of Fe2O3 react with 17.8 kg of CO and 4.5 kg of Fe are recovered, what is the percent yield for the reaction?

**Math**

I need help please. Draw a quadrilateral that is not a parallelogram.

**math**

$6350 is compounded semiannually at 14% for 12 years. What is the total amount in the compound interest account?

**chem**

Calculate ΔG° (in kJ/mol) for the following reaction at 1 atm and 25 °C: C2H6 (g) + O2 (g) → CO2 (g) + H2O (l) (unbalanced) ΔGf° C2H6 (g) = –32.89 kJ/mol; ΔGf° CO2 (g) = –394.4 kJ/mol; ΔGf° H2O (l) = –237.13 kJ/mol

**Probability and statistics**

Assume that a procedure yields a binomial distribution with a trial repeated n times. Use the binomial probability formula to find the probability of x successes given the probability p of success on a single trial.n=22, x=18, p=0.85, q=.15

**math**

300

**physics**

adding to what I just posted, so the Fnet is = Force of the rolling car (mgsin(15))-Force of friction. So Fnet=5580N-5000N=580N And Fnet=ma So acceleration=Fnet/mass 580N/2200kg= 0.264m/s^2

**physics**

the sin of the angle is 15 degrees. I just had the exact same homework problem and got the correct value for acceleration by doing what he said above.

**Physics**

The answer is 1.5A (B)

**Math**

2178/23 / 11

**Math**

Find the linear speed of a point that moves with constant speed in a circular motion if the point travels along the circle an arc length = 2178/23 kilometers in time t=11 seconds?

**Art**

ya is it c

**Art**

1. Which of the following answer choices contains a metaphor? A. His skin was sandpaper** B. The sun sparkled like a diamond C. She wanted to be like the birds and fly away D. They felt free when they ran across the doors 2. What is a key characteristic of a refrain in poetry...

**Math**

1. Which property is NOT a characteristic of a parallelogram? A. Opposite sides are not congruent B. All angles are congruent** C. Opposite sides are parallel D. Opposite angles are congruent

**physics**

A horizontal spring with k = 110 N/m has one end attached to the wall. A 290 g block is pushed onto the free end, compressing the spring by 0.160 m . The block is then released, and the spring launches it outward. Neglecting friction, what's its speed when it leaves the ...

**Pre-Calculus**

9 8

**Algebra 2**

Did I solve these right? 1. f(x)= -3x + 1 g(x)= -4x^2 + x + 2 Find g(f(x) ) -4(-3x+1)^2+(-3x+1)+2 -4(-3x+1)^2-3x+1+2 3-3x-4(-3x+1)^2 3-3x-4+24x-36x^2 =21x-36^2-1 2.f(x)= -2x + 1 g(x)= -3x^2 -x -1 Find (g /f)(x) -3x^2-x-1/-2x+1 3. f(x)=-x +2 g(x)= -4x2 + x + 5 Find (f o g)(x) f...

**pychology**

According to research led by Sarina Saturn, which of the following is predicted by variations of a particular gene on the third chromosome, which influences oxytocin functioning?

**Math 7th grade**

-0.5167 is this number rational or irrational ? Thank you

**Algebra**

Using two variables - A carpenter wants to cut a 24-foot board into two pieces so that one piece is 5 times as long as the other. How long should each piece be?

**physics**

A ball is thrown vertically upward from the edge of a cliff of height 131 m. The initial velocity is 77.7 m/s. how high is the cliff?

**Pre-calculus help**

I have two problems I am stuck on, if you could show me how to solve the problems it would be much appreciated. 1) Find sin 2x, cos 2x, and tan 2x from the given information. tan x = − 1/6, cos x > 0 sin 2x = cos 2x = tan 2x = 2) Find sin 2x, cos 2x, and tan 2x from ...

**Science Please Help Me 2**

1 / A 2 / A 3/ C 4/ A are they right ?

**Delete Question**

Hi! Is it possible to delete a question I asked since I got it answered? Thanks! Subject: Math Date: Monday, March 23, 2015 Time: 8:27

**Math**

Directions: Use the following matrix to perform the elementary row operations sequentially. A=[3 2 |8] [5 2 |12] 1.) (1/3) R1 From the original matrix 2.) -5R1+R R2 From matrix in question 1.

**Chemistry**

What is the molarity of an HNO3 solution if 24.1mL of a 0.250M Ba(OH)2 solution is needed to titrate a 15.0mL sample of the acid? Can you tell me the process to finding this answer?

**Science**

A sled and rider with a combined weight of 59 kg are at rest on the top of a hill 24 m high. (a) What is their total energy at the top of the hill? (b) Assuming there is no friction, what would the total energy be on sliding halfway down the hill?

**algebra**

A gym has an enrollment fee of $80 and a $25 fee per month of membership. Write an expression to represent the total cost of m months of membership?

**Physics**

-108379

**Derivatives**

Find derivative of y= x^3(5x-1)^4 I got y'= 2x(5x-1)^3 +16x^2+5x-1 is this right? If not what and where did I go wrong

**computer literacy**

The size of a font used

**Organic chem Extraction of caffeine from tea**

A. Interface B. Volatile compounds, like ether

**Math**

Outside temperature over a day can be modelled as a sinusoidal function. Suppose you know the high temperature for the day is 87 degrees and the low temperature of 63 degrees occurs at 5 AM. Assuming t is the number of hours since midnight, find an equation for the temperature...

**Drama**

Postmodern theatre, like other postmodern art forms, discards many of the ideas of modernism. Theories of modern theatre propose that access to universal truths can be achieved through artistic representation of life. Postmodern theatre, however, rejects the notion of make-...

**Drama**

How is 4.48 Psychosis by playwright Sarah Kane a postmodern drama?

**algebra**

Find the present value, using the present value formula and a calculator. (Round your answer to the nearest cent.) Achieve $225,500 at 8.55% compounded continuously for 8 years, 125 days.

**Algebra**

Find the present value, using the present value formula and a calculator. (Round your answer to the nearest cent.) Achieve $225,500 at 8.55% compounded continuously for 8 years, 125 days.

**Algebra**

Assume the car can be purchased for 0% down for 60 months (in lieu of rebate). A car with a sticker price of $42,900 with factory and dealer rebates of $5,100 (a) Find the monthly payment if financed for 60 months at 0% APR. (Round your answer to the nearest cent.) $ (b) Find ...

**math**

13% = 104 beads 1% = 104 divided by 13=N beads 12% = 12 x n = e So, Lucy has 96 blue beads (n = 8)

**Public Speaking**

Evaluating audience feedback to your speech presentation usually happens: A. before the speech. B. after the speech. C. during the speech. D. in the speech preparation

**Physics**

Can someone help with the following physics problem? This is the only one I'm having trouble solving. Thanks. A 3.6-m-long ladder leans against a frictionless wall as shown in the figure below. The coefficient of static friction between the ladder and the floor is 0.30. ...

**Math**

Oh! Ok thank you!

**Math**

What is the multiplicative inverse of 6 1/7? My answer- 16

**Math**

Thanks

**Math**

The volume of the cylinder is 15 cubic inches. If all the dimensions are multiplied by 2.7 what is the new volume? My Answer- 295.245

**Math**

Please help!

**Math**

A triangular prism has a volume of 92 in.³ if all dimensions are multiplied by 1.6 what is the new volume?

**Common Core State Exam**

Thank you so much as well Ms. Sue! I knew you would cometo save the day. That is what you always do :)

**Common Core State Exam**

Thank you sooooooooooooo much for your help Writeacher!!!!!!!!! ;):):)

**Common Core State Exam**

I need some tips on dong the best I could do on the common core state exam. Please do the best you can to give tips. And if you know a website that will help me study, please do give it to me. Thank you for all you support and help :)

**accounting**

Liz Marett is the chief financial officer for Fulton Restaurants. She delivered the following comments in a recent conference call with analysts that follow the company: "20X5 was another excellent year. Net income was a record setting $10,000,000. Food Revenue reflected ...

**Human relations**

A female doctor attempting to explain to her 27-year-old male patient that his severe acne can be cured with a specific drug, but the side effect of the drug might be that he will be temporarily bald.

**Language Arts**

Can someone tell me what the simple subject and simple predicates are in this sentence? Thanks Sports fans trade baseball, football, or basketball cards. a. sport fans/trade b. fans/or c. baseball/or d. fans/trade

**drawing**

FOUR :)

**Pre-Algebra**

Yes the the team would need to win 2 games for a total of 8 wins

**math**

is that the whole question or are you missing somthing

**pre cal**

f(x)=2x^2+12x-6 what is the min or max value ?

**math**

five

**Math Pre-Cal**

i really need the help i am so lost

**Math Pre-Cal**

how would i do that

**Math Pre-Cal**

The answer I got was 24, and it was wrong

**Math Pre-Cal**

It ask for the Min or Max value?

**Math Pre-Cal**

what is the value of f(x)=2x^2-12x-6

**Math Pre-Cal**

Ok I understand now on that so far. How do you find the value of a quadratic function?

**Math Pre-Cal**

When I am giving the point vertex of (1,-1) and another point of (2,2) and i need to put the answere in the form f(x)=ax^2+bx+c how would I go about doing that?

**Physics**

Friction is usually the killer of efficiency. How does a ramp relate to friction?

**Physics**

What is one advantage and one disadvantage of using a ramp? Explain in detail.

**Physics**

What affect does changing the mass of an object on a ramp have on the efficiency of the ramp? Explain.

**Physics**

Bryan tosses a 75.0 g rock into the lake. The rock leaves hus hand at a height of 175 cm above the ground travelling at 19.0 m/s. How high above the ground will the rock travel if it is accidentally thrown straight up? How high above the water will it travel if it is thrown in...

**Physics**

Bryan tosses a 75.0 g rock into the lake. the rock leaves hus hand at a height of 175 cm above the ground travelling at 19.0 m/s. How high above the ground will the rock travel if it us accidentally bryan tosses a 75.0 g rock into the lake. The rock leaves hus hand at a height...

**Physics**

Three objects with masses m1= 36.5 kg m2= 19.2 kg m3= 12.5 kg Are hanging from massless ropes that run over a frictionless pulleys. If the system is released from rest, what is the magnitude of the acceleration in m/s^2 of mass m1? ___________________ O O O I I I I I I I I I I...

**Physics**

Three objects with masses m1= 36.5 kg m2= 19.2 kg m3= 12.5 kg Are hanging from massless ropes that run over a frictionless pulleys. If the system is released from rest, what is the magnitude of the acceleration in m/s^2 of mass m1? ___________________ O O O I I I I I I I I I I...

**Physics**

An elevator motor provides 45.0 kW of power while lifting a 2000 kg elevator 35 m. If the elevator contains six passengers of the same mass and it takes 20.0 s to accomplish this task, determine the mass of each passenger. Assume the system is 83 % efficient.

**Physics**

A microwave rated at 1000 W heats a 500 g glass of water from 10 degrees C to 55 degrees C in 2 minutes. Determine the efficiency of the energy transformation.