# Posts by john

Total # Posts: 8,414

**Pre-calculus (trigonmetry)**

438.1

**Math - Geometry - Triangle Medians and Altitudes**

Points D, E, and F are the midpoints of sides BC, CA, and AB, respectively, of triangle ABC. Points X, Y, and Z are the midpoints of EF, FD, and DE, respectively. If the area of triangle XYZ is 21, then what is the area of triangle CXY?

**math**

Points $D$, $E$, and $F$ are the midpoints of sides $\overline{BC}$, $\overline{CA}$, and $\overline{AB}$, respectively, of $\triangle ABC$. Points $X$, $Y$, and $Z$ are the midpoints of $\overline{EF}$, $\overline{FD}$, and $\overline{DE}$, respectively. If the area of $\...

**Math**

15/27 ratio should be the same as win/162 15/27 reduces to 5/9 which will make the math a little easier. Can you finish it from here? 5/9 = win/162

**algebra**

length = 2(width) - 2 l = 2w - 2 area = lw area = (2w-2)(w) 264 = 2w^2-2w 0 = 2w^2 -2w-264 0= 2(w^2 - w -132) divide both sides by 2 0 = w^2 - w - 132 Factor and solve for w. you only want the positive value since it is a width. Once you have the width, use l=2w-2 to find the ...

**Science**

Describe the total momentum of billiard balls before and after the cue ball collides with another ball

**Art**

Bubbles is right I just got 100%

**Math**

In order to properly design a heating system for a greenhouse, the volume of air in the building needs to be determined. Find the volume of air in the greenhouse below. (3 pts)

**math**

Hi, How do I improve my math skills? I can't calculate in my head (I.e 2x43), I would actually have to write it down to solve it. I took pre-calc, calc and didn't have problem understanding. I don't know what is wrong. what should I do?

**physics**

A small ball of mass 65 g is suspended from a string of length 53 cm and whirled in a circle lying in the horizontal plane.If the string makes an angle of 28◦ with the vertical, find the centripetal force experienced by the ball. The acceleration of gravity is 9.8 m/s 2...

**physics**

A Navy jet (see the figure) with a weight of 219 kN requires an airspeed of 87 m/s for liftoff. The engine develops a maximum force of 100 kN, but that is insufficient for reaching takeoff speed in the 85 m runway available on an aircraft carrier. What minimum force (assumed ...

**Chemistry**

calculate the wavelength of a 0.245 kg baseball thrown at a speed of 40.m/s

**L.A.**

Bella Do u have the answers??

**Physics**

The crane shown in the drawing is lifting a 170-kg crate upward with an acceleration of 1.1 m/s2. The cable from the crate passes over a solid cylindrical pulley at the top of the boom. The pulley has a mass of 130 kg. The cable is then wound onto a hollow cylindrical drum ...

**Physics**

A charge of +444 μC is fixed at the center of a square that is 0.47 m on a side. How much work is done by the electric force as a charge of +5.8 μC is moved from one corner of the square to any other empty corner?

**Physics**

A 2160 kg car traveling at 10.5 m/s collides with a 2740 kg car that is initially at rest at the stoplight. The cars stick together and move 4.00 m before friction causes them to stop. Determine the coefficient of kinetic friction betwen the cars and the road, assuming that ...

**Trigonometry**

a person standing 400 feet from the base of a mountain measures the angle of elevation from the ground to the top of the mountain to be 25 degrees, the person then walk 500 feet straight back and measures the angle of elevation to now be 20 degrees, how tall is the mountain?

**Physics**

Your car is in a ditch. It requires 4500 N of force to get out of the ditch but you can only push with 750 N. What is the angle the rope needs to make, relative to straight across the road for you to be able to get the car out of the ditch? What is actually pulling the car out?

**Probability**

The conditional probability that exactly k rolls resulted in a 3, given that at least one roll resulted in a 3, is of the form: 11−(c1/c2)c3(c3k)(1c2)k(c1c2)c3−k,for k=1,2,…,6. Find the values of the constants c1, c2, and c3

**General Chemistry HELP!**

Research and describe one current application of the knowledge of the atom. This application can be in any field of your choice. This means the field can be scientific, such as medicine, or nonscientific, such as entertainment. The purpose of this assignment is to learn the ...

**math**

THANK YOU VERY MUCH Ms. Sue. I REALLY appreciate it :)

**math**

I'm. Sorry, it says explain what each ratio meaans. The ratio of bananas to apples is 4:1.

**math**

1.. Write the decimal three and four thousandths. 2.. the ratio of apples to bananas is 4:1.

**Chemistry**

In an acid-base neutralization reaction 25 mL of 0.4 M NaOH reacts with 50.00 mL of H2SO4 solution. Calculate the concentration of the H2SO4 solution?

**math**

The coordinates of point P are (-3, 5). Point R is a reflection of point P across the x-axis. Point S is a reflection of point P across the y-axis. Point R is located in quadrant . Point S is located in quadrant .

**math**

At a certain location in the Coachella Valley of California the elevation is 215 feet below sea level. Clara wrote this elevation as -215 feet. Is Clara's response reasonable? Explain the given elevation with respect to its relationship to 0.

**math**

3/8jof the cast in a musical hE TO SING. WHAT FRACTION OF THE CASt DOES not have to sing?

**maths**

how many terms are there in an arithmetric sequence if it has a common difference of 3 , a last term of 30 and the sum of its terms is 135

**statistics**

From Lab 3, Problem 2 2. The data set magnet is from an experiment to see the effect of voltage and number of turns on the magnetic force of an electromagnet. The experimenters expected to see a limit to which the number of turns could increase the force. (This is actually a ...

**Physics**

This is sort of a stupid problem. You don't need the mass of the object to solve the problem. If you look at the figure, the force corresponding to 10 m is 150 N and the one corresponding to 35 m is 250 N. Then the work is: W=(35-10)*(150+250)/2 ( this is the area of the ...

**physics**

As a protest against the umpire’s calls, a baseball pitcher throws a ball straight up into the air at a speed of 20.4 m/s. In the process, he moves his hand through a distance of 1.57 m. The acceleration of gravity is 9.8 m/s 2 . If the ball has a mass of 0.147 kg, find ...

**Chemistry**

Calculate the molar extinction coefficients for carotene and chlorophyll using the peaks of highest absorption and Beer’s law.Show your calculations.basically solve for e A = ebc Carotene (Yellow) = Highest peak 450 nm and 0.455 absorption A = ebc 0.455 = e*1cm*c? 0.455...

**English**

Parenthetical expressions include information that may be helpful but are not essential to the meaning of a sentence. They are de-emphasized by ________. A. dashes B. parentheses C. commas D. brackets I'm not really understanding this question. It has to be either B or D ...

**English**

Avoid ________ when writing an essay. A. summarizing B. using personal input C. quotations D. sermonizing D?

**English**

I apologize. I believe it is A

**English**

1. An example of a prediction conclusion is ________. A .suggesting what the audience might do after they read your paper B. picking up an idea or image suggested in the introduction and echoing it in the conclusion C. a logical extension of the information in the body of ...

**science**

Ans.: (1000mL/1L)(1.18 g/mL)(0.37)(1mol HCl/36.5 g HCl) = 11.96 M We want to make 100 mL of 6.0 M: 600 mmol HCl required V x M = V x M 100 mL x 6.0 mmol/mL = V x 11.96 M V = 50.17 mL Therefore, take 50 mL of the conc. HCl and dilute to exactly 100.0 mL with water.

**Microeconomics**

The demand for a good is given by QD = 750 – 0.4P. What is consumer surplus at a price of $80?

**math**

If a fowl is treated, probability of dying is 1/10 while if not treated the probability is 7/10 calculate the probability that, a fowl picked at random from the 36 fowl is (i) Treated with the drug and will die (ii) Not treated with the drug and will die (iii) Not treated with...

**Geometry**

given ab is a tangent of point x, ab=70 and xd= 12 what is the measure of db?

**physics**

If a rubber tire having a weight of 18.0lbs requires a force of 38.0N to keep it in uniform motion on a level highway find the coefficient of kinetic friction.

**math**

The angle which the tangent to the curve at the point (2, 5) makes with the horizontal

**math**

Integrated Math 1. The Overland Trail: Traveling at a constant Rate. Who will make it? Need help graphing 3 sets of data on one graph?

**economic theory**

assume that a business firm produces two commod ities, X and Y, with two different inpu ts, Labour (L) and Capital (K). The total quantities of L and K available per un it of time are specified as L = 1600 labour hours; and K = 20 00 units. In addition, assume that producing 1...

**math**

The radius of circle is given as 2.8 cm to 2 significant figure (a) If C is the circumference of the circle, determine the limits between which C/π lies. (b) By taking π be 3.14; find to 4 significant figures the line between which the circumference lies

**math**

trying to help the kid with hw but not smart enough. please help. Thank You! -(5/7) ^ -2/5 can be written as -(a)^b where "a" is a positive rational number that is greater than 1 and "b" is a positive rational number that is less than 1. Find 'a' ...

**math**

Samuel bought three cups and four spoons for Kshs 324. Daniel bought five cups and Mary bought two sppons of the same type as those bought by Samuel. Daniel paid Kshs 228 more than Mary. Find the price of each cup and spoon.

**math**

There are two sign posts A and B on the edge of the road. A is 400 m to the west of b. A tree is on a bearing of 60 degree from A and a bearing of 330 degree from B Calculate the shortest distance of the tree from the edge of the road.

**math**

There are two sign posts A and B on the edge of the road. A is 400 m to the west of b. A tree is on a bearing of 60 degree from A and a bearing of 330 degree from B Calculate the shortest distance of the tree from the edge of the road.

**Finance**

11.40

**chemistry**

0.000839

**math**

Mary bought and beans from a wholesaler. She then mixed the maize and beans ratio 4:3, she bought the maize as $12 per kg and the beans $4 per kg. if she was to make a profit of 30 %. What should be the selling of price 1 kg of the mixture?

**math**

The cash prize of a television is shillings 25000. A customer paid deposits Shillings 3750. She repaid the amount owing in 24 equal monthly installments. If she was charged simple interest at the rate of 40% p.a, how much was each installment

**math**

16 2/3% or 16.67%

**math**

Mary bought and beans from a wholesaler. She then mixed the maize and beans ratio 4:3 she bought the maize as $12 per kg and the beans $4 per kg. if she was to make a profit of 30 %. What should be the selling of price 1 kg of the mixture?

**math**

Thanks Ms.Sue.. That's what I got when I divided it. So the 50 T-shirts is the better deal.

**math**

one company makes 50 t-shirts for $295 and another offers 40 t-shirts for $250. which company is the better deal? answer please

**Finance**

Determine the annual net cost of these checking accounts: a. Monthly fee $4, check-processing fee of 20 cents, average of 23 checks written per month

**Finance**

Your parents are retired and have expressed concern about the really low interest rates they’re earning on their savings. They’ve been approached by an advisor who says he has a “sure-fire” way to get them higher returns. What would you tell your parents ...

**physics**

Calculate the total resistance for ten 120 ohm resistors in series

**math**

Spencer Morris works in the telemarketing division for a company that pays a salary of $735 per month plus a commission of 31 2% of all sales greater than $15,500. If he sold $45,900 last month, what was his total gross pay?

**AP Chemistry**

Same. I'm still stuck on this question. Did you get the answer?

**Chemistry**

Are you taking AP Chemistry online? I'm taking it too! Some questions are hard and there are no answers for it on the internet. :( Which unit are you doing right now?

**Math**

A cubic foot of water weighs 62.4 lb. A basketball has a radius of 0.39 ft. How much would the basketball weigh if it was filled with water I did 4 times pie times 0.39^3 over 3 and get 0.24834888, I just need to know what to do now ^= power symbol

**calculus**

(cx)={X if 0 is less than or equal x less than or equal 10 and 0.9x if 10<x

**Phsyics**

A skier is gliding along at 2.5m/s on horizontal, frictionless snow. He suddenly starts down a 10∘ incline. His speed at the bottom is 13m/s . What is the length of the incline? How long does it take him to reach the bottom?

**Chemistry**

Since chlorine has similar electronegativity as nitrogen, why can't chlorine form hydrogen bonds?

**math**

27=-2y+15

**science gases**

fart

**Physics**

What is the maximum height above ground a projectile of mass 0.67 kg, launched from ground level, can achieve if you are able to give it an initial speed of 78.5 m/s?

**MATH**

Sabah has $450 to pay for college textbooks. She expects to pay about $75 per book. Her friend told her that 4 of them can be checked out of the library for free.

**ALGEBRA**

2/3

**College Physics**

An electron in a television tube travels the 12 cm distance from the grid to the screen at an average speed of 7.00 107m/s. How long does the trip take?

**Economics**

How can a trade deficit actually increase the productivity of an economy? 1. by causing people to save 2. by building up a large amount owed 3. by importing funds used for capital deepening 4. by importing goods for short–term use I think 1, can anyone verify?

**algebra**

Let X be a number. Translate the English phrase or sentence into a mathematical expression. Then evaluate the expression for X =8. The expression is ?

**statistics**

As part of a data base on new births at a hospital some variables recorded are the age of the mother, marital status of the mother (single, married, divorced), weight of the baby, and gender of the baby. Of these variables A. age, marital status, and weight are quantitative ...

**science**

assess why the earlier expedition may have failed.

**math**

Solve, using linear combination. 5x + y = 2 4x + y = 4 Write your answer as an ordered pair or write "no solution" or "infinitely many solutions".

**True or False?**

The phases of the moon depend on how much of the lighted side of the moon can be seen from Earth

**True or False?**

Tides are caused by the force of gravity from the sun and moon acting on Earth.

**economics**

1. A sudden escalation in medical costs for treatment of ischemic heart disease would immediately: Answer Benefit providers. Be passed on to consumers. Benefit insurance companies. Decrease insurance company profits in the short term. Decrease tax revenues to the federal ...

**Physics**

A boy is trapped in a large area of very soft mud. A man rescues the boy by crawling across a long, light board rather than by walking into the mud. What effect, if any does the board have on the force and the pressure on the mud, compared with walking? A. force and pressure ...

**Physics**

Chisel is a pivot point between the wire and a 2 cm distance between the pins and the hand is 10 cm F 50 Newton force How much is the mechanical advantage? How much is the forces acting on the wire?

**Chemistry**

A gas occupies 30 0dm3 at stp what volume would it occupy at 91 and 380mm hg?

**Science**

In the past, what makes someone or a group of people considered to be "unfit" members of society?

**Math**

Never mind I eventually found out how to solve it myself.

**Math**

Given f(x)=-2-3x-x^2 , find f(1+k)

**Science**

What features of Western culture help lead people to believe in their primacy over nature?

**Algebra 2**

Adults 5.00 Kids 3:50 240 tickets sold for 1140 How many adults? How many kids?

**PreCalc**

Thank you sooo much! But how can I solve the 5th degree one algebraically?

**PreCalc**

Can you guys also help me on this one? x^5 + 4x^4 -16x -16 < 0

**PreCalc**

Solve each inequality: (1/(2b+1)) + (1/(b+1)) > (8/15) (2/(x+1)) < 1 - (1/(x-1)) My teacher told me the answer is in interval notation, and that a number line is used to solve.

**Math**

(8.86 + 1.0 * 10^-3) / (3.610 * 10^-3) Calculate the above formula, expressing the answer in scientific notation with the correct number of significant figures: 8.86 + 1.0 * 10^-3 = 8.86 + 0.0010 = 8.8610 = 8.86. 8.86/(3.610 * 10^-3) = 2454 2.454 * 10^3 Please confirm if I did...

**quantitative methods**

a packing device is set to fill detergent powder packet with a mean weight of 5 kg . The standard deviation is known to be 0.01 kg. these are known to drift upwards over a period of time due to machine fault, which is not tolerable. A random sample of 100 packets is taken and ...

**English**

What belief does Whitman share with Ralph Waldo Emerson and other transcendentalists? A) We should live our lives well to achieve everlasting happiness. B) Man learns his most important lessons and insights in the present, through direct experience. If I recall correctly ...

**physics**

P.S. I forgot to multiply by the .5 in the second to last step . It should read : d = 696 + .5 * 1140 m d = 1266 m

**physics**

d = V0 * t + 1/2 a t ** 2 where average acceleration a = (V1 - V0) / dt V0 = 58 m/s V1 = 153 m/s dt = 12 s a = (153-58)/12 m/(s*s) a = 7.9 m/(s*s) d = 58 * 12 m/s *s + .5 * 7.9 * (12 * 12) m/(s*s) * (s*s) d = 696 + 1140 m d = 1836 m

**Physics and Math**

P.S. forgot to take square root in time calculation. Should be t = .0007s so v = 100 - 40000 * .0007 * .0007 v = 100 - .02 v = 99.98 m /s

**Physics and Math**

v = V0 + a * t F = m * a s = .5 * a * t^2 where s = 0.01 m V0 = 100 m / s m = 0.5 kg F = 2000 kg m/(s^2) solving f=ma for a : a = f/m = -2000/0.05 m/(s^2) = -40000 m/(s^2) solving s = .5at^2 for t : 2s = at^2 2s/a = t^2 t = square root(2s/a) t=square root (2 * 0.01m) / -40000 ...

**physics**

v = V0 + a * t V0 = 0 a = 2.75 m/s^2 t = 3.00 s v = 0 + 2.75 * 3.00 m/s v = 8.25 m/s