# Posts by richard

Total # Posts: 302

I have tried everything to help my son and I can't figure it out. I am trying to get an end result of 38 out of the following equation. We have to add parentheses to make it equal 38 any help !!! 3+6*5+4/2-7

Chemistry
Thanks to Dr. Bob for answering all these questions! I always do poorly on conceptual problems. Consider the following equilibrium system at 25°C and select the true statement below: H2PO4?(aq) + SO42?(aq) ? HSO4?(aq) + HPO42?(aq) ?G°rxn > 0 at 25°C (1) this is ...

calculus
How would you use series to evaluate the lim(x->0) of (x-arctanx)/x^3? I'm getting stuck, and the answer says it's 1/3 but I don't know how they got there.

calculus
I got 1+3x+6x^2+10x^3+15x^4... but I was wondering how I would write a series for this.

calculus
How would you determine the power series of 1/(1-x)^3. I know that the series of 1/(1-x) is x^n, but how would you manipulate it for this scenario?

math
there are 20 students in mark`s homeroom class. Ten percent of the students in marks homeroom class are also in art class He finds the number of students in his homeroom class who are also in art class like this . Can you tell me the answer of how many error he made.

ed tech HELP PLS
I would say , A. What you post can hurt or slander others***

math-integrating factor
dy/dx - y/x = 0 I got 1/x, but I am not sure if this is right or not.

Algebra 2
There are 41 individuals in a grocery store, of which 18 are female. the total number of individuals who are 30 years old or older is 24 of which 10 are female. If an individual is randomly selected, what is the probability that they are either male or 30 years or older?

Chemistry
Ammonia (NH3) reacts with oxygen to produce nitric oxide (NO) and water (see balanced equation below). How many grams of oxygen do you need to react with 21.4 g ammonia? __4_NH3 + __5_O2 → __4_NO + _6__H2O

Maths
13m

physics
a ball projected vertically upwards from the top of the tower 60 meters high with a velocity of 30 meters per second. what is the maximum height above the ground? how long does it take to reach the ground?

chemistry
pH of 1.0 x 10-8 M RbOH

math
A flame is ejected vertically upward from the groung at 15m/s.Find the height of the flame after 2.5seconds

chemistry
21.5%

life orientation
Clealy describe a recent corruption and fraud cases in the country making headlines in the media

Algebra
Explain how you can tell the function is not linear by using points on its graph. Make sure to include in your answer the Points you used to determine that the function is not linear.

Maths
a map with a scale of 1cm to 5km has an area of 405cmsquare. what is the actual area of this map on the ground?

Physics
A Ball Of Mass 0.25kg Losses Half Of Its Velocity When It Makes A Head On Collision With An Identical Ball Q At Rest.After The Collision,Q Moves off with a speed of 2m/s in the original direction of p.calculate the initial velocity of p.

math
70

Intro to Chemistry
A 9.40-L container holds a mixture of two gases at 47 °C. The partial pressures of gas A and gas B, respectively, are 0.344 atm and 0.520 atm. If 0.160 mol of a third gas is added with no change in volume or temperature, what will the total pressure become?

1. ZG Jewelers purchased fashion bracelets for \$38.87. This jewelry store regularly marks up fashion merchandise 52% of the selling price. What is the minimum selling price that ZG Jewelers should charge? 57.20 59.23 80.98 94.94

science
a 2kg stone is dropped from the top of a 20 buliding (a) at what height does its potential energy energy equal to its kinetic energy?

social studies

accounting and finance

math
There are 40 vehicles in a parking lot. Twenty percent of the vehicles are pickup trucks. How many pickup trucks are in the parking lot?

Physics (Thin Film Interference)
Sorry I got 91.46 and 274.379. You were supposed to add 1/2 wavelength for the second value but why can't you add 1 whole wavelength especially since destructive interference is 1/2 wavelengths, 3/2 wavelengths, 5/2...etc.?

Physics (Thin Film Interference)
A layer of transparent plastic (n=1.61) on glass (n=1.52) looks dark when viewed in reflected light whose wavelength is 589 nanometers in vacuum. Find the two smallest possible nonzero values for the thickness of the layer. Answers are 183 nm and 366 but I don't understand...

science
0.4

Math
A child's desk is made so that the dimensions are two-thirds the dimensions of a full-size adult desk. Suppose the top of the full-size desk measures 54 inches long by 36 inches wide. What is the perimeter and area of the topof the child's desk?

English
Hi! I'm trying to find a lit device for this quote. This quote is from "The Story of An Hour" by Kate Chopin. I'm struggling to find a lit device. So far I've come up with "contrasting diction" but I'm trying to find an even stronger one. ...

tourism,Maths Literacy,Geography &Life Science
U cn b a social worker,psychologgy an lawyer but the requiriments for this,u mst have a bachelor degree

math help
3^(n+1)-3^(n-2) Need help simplifying this please.

College Algebra
The sum of three consecutive natural numbers is 966. Find the numbers.

Chemistry
A 150.0 mL sample of a 1.50 M solution of CuSO4 is mixed with a 150.0 mL sample of 3.00 M KOH in a coffee cup calorimeter. The temperature of both solutions and the calorimeter was 25.2°C before mixing and 31.3°C after mixing. The heat capacity of the calorimeter is 24...

Math
Would you add the 1/16 inch to the 8 1/2 inch to account for each cut and then divide by the 32 FT 10 1/2 inch? or what? I'm confused on how to go about doing the problem.

Math
How do you account for the 1/16 inch cuts?

Math
A cable is 32 feet 10 1/2 inches long is to be cut into 8 1/2 inches lengths. Allow 1/16 inch for each saw cut.

precalculus
thank you

precalculus
use pascal's triangle to expand the expression (2x-3y)^3

college precalculus
so one is arithmetic number two is geometric number three is neither?

Pre-Calculus
f(x) is a sinusoidal curve with maximum at f(0)=10 and next minimum at f(6)=0. Find the equation?

Physics
Calculate the work required to pull a wagon along a horizontal road for 4.0x10^2 m at a constant speed of 3.0 m/s if the force of friction is 8.0 N.

Math Help
Hi! I need help with this practice problem. My teacher gave us the answer, "2cot u" BUT she wants us to figure out why that's the correct answer. I'm having some trouble with this and could really use some help. Thank you! Problem: 1+ sec u/tan u - tan u/1+...

Chemistry
The following questions relate to the chemical equation shown below. Since this is a multi-stage question, be sure to write down the balanced equation and the values for deltaHo and deltaSo before proceeding. A2(g) + 3 B2(g) → 2 AB3(g) deltaHo = -217 kJ mol-1 deltaSo = -...

Chemistry
Part 1 of 2 Write the balanced molecular equation for the reaction between iron metal (the nail) and aqueous copper II sulfate and classify this reaction. Include the states: solid (s), liquid (l), aqueous (aq), or gas (g). Use your observations to help you determine the ...

Chemistry
A cell exhibits a standard Ecell of 0.35V at 298K. What is the value of the equilibrium constant for the cell reaction if n = 2?

Nice one!

Computers
Sell it and get a proper PC.

Math
Hi I am Richard , on this problem mark`s has 20 students and he changes it to 20% percent and that is his error.

Math
he the 20 students and change it to 20% to 200.

physics
A ball is rolling on a table and leaves the end side of the table with a velocity of 1.5 m/s. The table is 0.70 m high and the ball has a mass of 0.850 kg. What's the speed of the ball when it hits the ground? What equation should I use?

Algebra
Let "m" be the number of modern rockers. INEQUALITY: 15c+12m<=3000, c>=0, m>=0

Law of Sines

Law of Sines
Oh nvm thanks Damon.

Law of Sines
Thanks! I should have mentioned this in the question, but the answer sheet asks for two values of angle A rather than 1.

Law of Sines
In Triangle ABC, a=15cm, c=9cm, and angle C= 35 degrees. Find b and angle b. (Recall sin theta= sin (180 degrees-theta). I'm not sure how to approach this.

Physics
The wavelength of a stationary wave is 36.0cm. What is the distance between a node and the next anti -node

physics
According to the question:the hill rises at 37.7m to the vertical [y-axis] and 100m to the horizontal[x-axis] in the process a right-angle triangle is obtain and an angle of 90 is also obtain. 90 is the angle inclined at the horizontal

Trigonometry
If the distance covered by an object in time t is given by s(t) = t^2 + 5t , where s(t) is in meters and t is in seconds, what is the distance covered in the interval between 1 second and 5 seconds?

Physics
Sorry, there was a typo. *51 degrees opposite the 150 cm side.

Physics
What is the value of each of the angles of a triangle whose sides are 95, 150, 190 cm in length? I have tried to do this problem, don't get me wrong, but I don't really know where to go. Can someone tell me how to even approach this problem? The textbook states that ...

Math
Roberto Wins- 1/4 Roberto Loses- 3/4

english

Ratio of two triangles
What would the ratio be if the first triangle has sides of 4cm, 8cm, and 12cm and the second triangle had sides of 1cm, 2 cm, and 3 cm? Would the ratio be 4:1 or 1:1/4?

Physics

Physics
A ladder, 5.0 m long, leans against a frictionless wall at a point 4.0 m above the ground. A painter is climbing up the ladder. The mass of the ladder is 12.0 kg and the mass of the painter is 60.0 kg. The ladder begins to slip at its base when the painter is 70 % of the way ...

Chemistry
34J

geometry
nipple

Math
A(n)=A(n-1)-4;a(1)=8

Science
Hannah is comparing a rock from a riverbed and a rock from deep underground. One is very smooth, and the other has very rough edges. Explain why each rock was probably found in that location.

Earth Science
ummm A?

Earth Science
My first guess was A but then i read B this is confusing

Math Help
Was #1 correct?

Math Help
I got #1 C, #2 D and #3 \$6.50?

Math Help
1.) You have \$22 in your bank account, and you deposit \$11.50 per week. Your cousin has \$218 in his bank account and is withdrawing \$13 per week. The graph of this problem situation intersects at x=8. What does this mean? A. In 8 weeks, you will have triple the amount of money...

CHEMISTRY
How to prepare a 500ml 0.2M NaOH solution from 2.0M NaOH solution

Stats
A production process produces an item. In a recent study, the company found that 20% of all items produced were defective. Each item is inspected before being shipped. 10% of the items were misclassified( labeled as defective when they were good or labeled good when they were ...

Statistics
A production process produces an item. In a recent study, the company found that 20% of all items produced were defective. Each item is inspected before being shipped. 10% of the items were misclassified( labeled as defective when they were good or labeled good when they were ...

science
an object with a volume of one cu ft , weighing 150 lbs. is embedded in the sediment at a depth of 99 fy. in the ocean harbor. the object is best lifted to the surface by

Macroeconomics
Graph the following aggregate supply and demand curves (be sure to draw to scale). Real GDP (in \$ trillions) Price Level Supplied Demanded Increase / Decrease 100 4 16 110 10 15 140 14 12 200 15 6

Math
An airplane is flying at a velocity of 300km/h S30degW in a wind blowing at a velocity of 50km/h S20degE. What is the true speed and direction of the plane?

chemestry
How many grams of O2 are needed to produce 45.8 grams of Fe2O3 in the following reaction? 4Fe(s)+3O2(g) - 2Fe2O3(s)

quantitative rsearch
A manufacterer of computers designed to aid social scientists in analyzing rsearch data claims that are operational for at least 80% of the time . during the course of the year one computer was operational for 270 days. test, at the 1% CONFIDENCE LEVEL, whether the ...

physics
IF A 0.5 Kg baseball(at rest) is hit by a bat with a force of 200.0 N what is the magnitude of the baseball just as it is leaving the bat?

statistics
1.50

Science(applied physics)
vi= 18 m/sec constant vj= 24-gt= 24-9.8*6= 24-58.8= -34.8 m/sec v^2= vx^2+vy^2= 18^2+(-34.8)^2=1535.04 KE= 1/2mv^2 KE= .5*1*1535.8= 767.9 joules

Physics
Time for asteroid = (RadiusEarthOrbit/RadiusAsteroidOrbit)^3/2 * Time for Earth Ta= (475/150)^3/2 *1 = 5.54 yr

Pre Calculus
There are ten equal parts to a circular track for 2 toy cars and the distance from the inner to the outer is 3.4 inches. What is the width of the track?

maths
both my hundreds and units digits are one-half of my tens digit.the sum of my three digits is 16. what am i?

Physics
Differenciate between speed and velocity

physics
A 224 g particle is released from rest at point A along the diameter on the inside of a fric- tionless, hemispherical bowl of radius 44 cm. The acceleration of gravity is 9.8 m/s2 .

Physics
A bead slides without friction around a loop- the-loop. The bead is released from a height of 12.9 m from the bottom of the loop-the- loop which has a radius 4 m. The acceleration of gravity is 9.8 m/s2 . A 4m 12.9 m What is its speed at point A ? Answer in units of m/s

Physics
You have a 40 inch wheel tow 20 inch wheel to a 5 inch wheel how many revolutions does the 5 inch wheel have to make to make the 49 inch wheel rotate 1revolution?

math
Twice Brayton's age increased by 5 resuts in 49

Physics
A 345N load is suspended from a cable. What is the acceleration of the load if the tension in the cable is 275N£¿

Algebra
solve by elimination: 6a+2b = -48 -6a+b = 57 What is the solution set ( , )?

Math241
How do I solve x^2+4y^3=-828 at pont (-6,-6) The slope=

Pre-Calc
f(x)=(24x3+68x2+24x−32)/(4x3+56x2+236x+280) I need help finding the roots and the hole for this problem.

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