# scott

Newest questions posted by scott-
## math

if sin x =0.5 what values satisfy this equation in the range -180 -
## Chemestry

What is the rms speed of Cl2 molecules at 335 K? -
## Chemistry

If 25.0 g S8 (molar mass = 256.56 g/mol) is made to react with 2.0 L O2 at 25 oC and 1.0 atm, what is the maximum amount (in grams) of SO3 produced? -
## Math

Solve? 5 sqrt 2^3x * 64^2x+2 =32768^x -
## Math

1. A car is worth $23000 in Jan 2017 in the first year the car depreciates by 15 percent per annum and then 7 percent every year after that. a) what will the car be worth in Jan 2023? b) when will the car be worth $5000? 2. In 2017 the population of a -
## Math

1. Iodine-131 is used to find leaks in water pipes it has a half life of 8.14 days. If 36 days have passed and there is now 2.34g left. What is the initial amount? 2. Sr-85 is used in bone scans and has a half life of 64.9 days. If there is 23 percent of -
## Chemistry

If a gas effuses 1.618 times faster than Kr (molar mass = 83.8 g/mol) what is the molar mass of the gas? -
## physics

A 3 kg block is attached to an ideal spring with a force constant k=200 N/m. The block is given an initial velocity in the positive direction of magnitude u= 12 m/s and no initial displacement (xi=0). Find a) the amplitude, b) the phase angle, and c) write -
## Physics

Two people carry a heavy electric motor by placing it on a light board 2 meters in length. One person lifts at one end with a force of 700 N, and the other lifts the opposite end with a force of 500 N. What is the weight of the motor, where along the board -
## Physics

In Young's experiment a mixture of orange light (611 nm) and blue light (471 nm) shines on the double slit. The centers of the first-order bright blue fringes lie at the outer edges of a screen that is located 0.423 m away from the slits. However, the -
## Math

The volume of a rectangular pyramid is 4,000 cubic feet. The area of the base is 40 square feet. What is the height of the pyramid? -
## math

Determine whether a figure with the given vertices is a parallelogram. Use the method indicated. A(3, − 9), B(10, 1), C(4, 10), D(−9, 3); Distance and Slope Formulas -
## math

Given the set of vertices, determine whether parallelogram ABCD is a rhombus, a rectangle, or a square. List all that apply. A(5, 10), B(4, 10), C(4, 9), D(5, 9) -
## math

What is the outlier for the following set 0,0,1,2,4,5,5,5,5,5,5,5,5,5,5,5,5,6,6,7,7,7,7,8,9 And why -
## Bio chem

How many mL of 0.80 molar NaOH must be added to 20 ml of 0.40 of molar propionic acid, in order to produce a solution with a pH of 4.89? (PKa of propionic acid is 4.89.) -
## Geometry Proofs

Trying to solve a proof. Triangle ABC. D is a point on side AC and E is a point on side BC. There is a line from Angle B to Point D and a line from Angle A to Point E. My Givens are AD = BE and BE>AE. I need to prove BC>AC. This is for my 7th grade -
## Math

The scores on the GRE are normally distributed with a mean of 541 and a standard deviation of 89. Use the 68-95-99.7 rule to find the percentage of people taking the test who score between 363 and 541 -
## Math - Trig

Two buildings of equal height are 850 feet apart. An observer on the street between the buildings measures the angles of elevation to the tops of the buildings as 29° and 40°. How high, to the nearest foot, are the buildings? I don't know how to -
## Chemistry

Tooth enamel consist mainly of hydroxyapatite (Ca5(PO4)3(OH). When tine (II) Flouride is added to toothpaste it reacts with the enamel to product a more decay-resistant material fluorapatite (Ca(PO4)3F. The by-products of this reaction are tin (II) oxide -
## Chemistry

Silicon Carbide, SiC, is prepared by heating silicon dioxide in the presence of graphite. Carbon dioxide is the by-product of the reaction. How many grams of silicon carbide can be formed from the reaction of 50.0 grams fo graphite with 50.0 grams of -
## Chemistry

A scientist studying the reaction between decaborane (B10H18) and oxygen mixed 1.00 x 10^2 grams of decaborane with 2.75 x 10^2 grams of oxygen. Compute the masses of all substance present after the reaction went ot completion, generating B2O2 and water as -
## Algebra

I am 6 years older than my wife. Our twins go to the local comprehensive school. One of the twins noticed that the sum of their ages divided into the product of my age and the age of my wife is 63. How old am I? -
## Calculus applications

The bending moment (M) along a beam is M = WLx/2 -Wx2/2 kNm where x is the distance of a beam length L from the left hand end. W is the weight per unit length. (a) Shear force is calculated as the differential of bending moment. Find an expression for -
## math

The Holy Father sent a courier from Rome to Venice, commanding him that he should reach Venice in 7 days. The most illustrious Signoria of Venice also sent another courier to Rome, who should reach Rome in 9 days. And from Rome to Venice is 250 miles. It -
## Calculus II

If f(x) - x cos (x), how many intervals would be needed to approximate with the Trapezoidal Rule with an error of E -
## Math~ Algebra 1

Two cars are traveling on the same highway. The first car is traveling at an average rate of 44mi/h. The second car leaves an hour late traveling at an average rate of 55mi/h. How long will the cars have traveled when the second car catches up with the -
## Chemistry

A flask of known volume was filled with air to a pressure of 3.6atm. This flask was then attached to an evacuated flask of known volume and the air was allowed to expand into the flask. The final pressure of the air (in both flasks) was 2.7atm and the -
## physics

a slingshot launches a rock straight upward at 25 m/s, how high does the rock go, how long is it in the air, what is the velocity and the acceleration of the rock at its highest point -
## physics

a greyhound is capable of running at 40 mph, how many meters could the greyhound run in 3 minutes at this speed, how many seconds would it take the greyhound to run 1 km at this speed -
## physics

a boy uses a slingshot to launch a rock with a velocity of 30m/s how long does it take it to reach a height of 20m,what maximum height does the rock reach, what is the velocity of the rock at this height, what is the velocity of the rock just before it -
## physics

the required takeoff speed for a large airplane is 180mi/hr(80m/s)the plane is capable of accelerating at a rate of 4m/s^2 assume the plane starts at rest, determine the minimum runway length required for this plane to safely take off, a smaller airplane -
## Science

I can be traced back to 3000bc, often go unnoticed, can be overhead, under feet or somewhere in between, evolution has changed me, am lighter than I used to be, and can protect your investment. -
## math

The area if a rectangle is x3y4. Which expression represents the length if the width is x2y -
## Gen Chem

Knowing the MW of salicylic acid (138.12g/mol), design a procedure to make 100mL of a 0.0050M salicylic acid solution. -
## Grade 12 Calculus and Vectors

A homeowner wants to enclose a rectangular garden with fencing The garden will be adjacent to his neighbours lot. There will be fencing on all four sides. His neighbour will be paying for half of the shared fence. What should the dimensions of the garden -
## Math

Given function 3x/x^2-x-12 sub in -1 for x. I get the value x=0.3. Is that right? -
## Physics

A 0.11-kg balloon is filled with helium (density = 0.179 kg/m3). If the balloon is a sphere with a radius of 5.4 m, what is the maximum weight it can lift? -
## Algebra

A man paid $7.80 for 5 The grams of peanuts and 3 kg of walnuts. Walnuts are $.20 a kilogram more than peanuts how much did she pay per kilogram for each -
## home school

In which of the following are 1/2,5/6, and 5/8 arranged in ascending order? -
## Math Question

Write the fraction below as a decimal. 7 --- = 100 -
## Math

If a pie was cut into sixths and one cut into eighths how many pieces are there altogether? -
## math

Solve for all real values of y: |3y+7|=|2y-1|. -
## Trig

a road is inclined at an angle of 45degrees. After driving 300 feet along this road, find the driver's increase in altitude. -
## algebra

Use the rational zeros theorem to find all the real zeros of the polynomial function. Use the zeros to factor f over the real numbers. f(x)= x^4+6x^3-11x^2-24x+28 Molon -
## Math

If I put $20,000 into a CD in 1990, with a recurring 8.125% interest rate, how much would that amount to in 2015? -
## english

Which sentence is correct? a.Each guitar must be in their own case. b.Each guitar must be in its own case.****** c.Each guitar must be in his or her own case. ******-answer -
## english

Which sentence is punctuated correctly? a.“Thunder is good,” said Mark Twain, “But it is lightning that does the work.” b.“Thunder is good, said Mark Twain, but it is lightning that does the work.” c.“Thunder is good,” said Mark Twain, -
## Chemistry

Did u think about it? -
## Math

Arianna is taking care of her uncle's dog during the week. He left 3 cans of food for 5 days. How much good should she give each day assuming the dog eats exactly the same amount each day -
## algebra

two mechanics worked on a car the first mechanic worked for 15 hours and the second mechanic worked for 5 hours together they charged a total of 1525 what was the rate charged per hour by each mechanic if the sum of the two rates was 175 per hour -
## Math

If you would walk around the earths Equator with an average speed of 5 miles per hour, how many days would you need to walk to come back to your starting point? -
## math

how to explain to my son write doubles fact you can use to find the sum.Write the sum 2+3= -
## Math

Mara finished 1/5 of her assignment on Saturday and 3/8 of her assignment on Sunday. What fraction of her assignment did she complete on Saturday and Sunday? --Thank you!-- -
## Algebra

The boat travels 60 miles to an island and the same 60 miles coming back. Changes in the wind and tide made the average speed on the return trip 3 mph slower than the speed on the way out. If the total time of the trip took 9 hours, find the speed going to -
## math

express a single logarithm 1/3 log(b, x+3) log(b, y-4) log(b, x) -
## physics

A body is projected at an angle of 30degree to the horizontal with a velocity of 150metre per seconds.Calculate the time it takes to reach the greatest height,take g=10metre per seconds square and neglect air resistance. -
## math

A can of oil is 8 inches high and 8 inches in diameter. What is the approximate volume of the can? -
## Physics

A person whose mass is m = 96.0 kg steps on a mechanical bathroom scale placed on an inclined plane that makes the angle α = 15.3° with the horizontal. What is the reading on the scale? -
## Statistics

The manager of a company wants to investigate job satisfaction among its employees. One morning after a meeting, she talks to all 25 employees who attended. Does this sampling plan result in a random sample? What type of sample is it? Explain. -
## math

Why does Zara have a good driving record? -
## Statistics

Sammy and Sally each carry a bag containing a banana, a chocolate bar, and a licorice stick. Simultaneously, they take out a single food item and consume it. The possible pairs of food items that Sally and Sammy consumed are as follows. chocolate bar - -
## Calculus

In a poll of 400 voters in a certain state, 61% said that they opposed a voter ID bill that might hinder some legitimate voters from voting. The margin of error in the poll was reported as 4 percentage points (with a 95% degree of confidence). Which -
## Calculus

Joe dealt 20 cards from a standard 52-card deck, and the number of red cards exceeded the number of black cards by 8. He reshuffled the cards and dealt 30 cards. This time, the number of red cards exceeded the number of black cards by 10. Determine which -
## Algebra

(8,3);y=-1/4x+7 -
## Statistics

A researcher predicts that watching a film on institutionalization will change students’ attitudes about chronically mentally ill patients. The researcher randomly selects 36 students, shows them the film, and gives them a questionnaire about their -
## Physics

What is the volume of water at 95 degrees Celcius if at 5 degrees Celcius the water is 5.56L? -
## Physics

A raft measures 1.7m x 0.67m x 0.14m, and it has a mass of 13.5kg. What is the maximum mass that the raft can hold and still stay afloat -
## not school

Needing help setting up equation.if 1/4 of inch is equal to one foot of actual size dimension,determine the length represented by 7/8.is it a division problem.and if so he would I write it out -
## Math

What simplified common fraction is equivalent to 0.05757575757 -
## accounting

The Bean Company makes a sale with an invoice price of $97,000 on 10/1/14. The note is due on 10/1/17. There is no interest rate stated in the note. The market rate for similar notes is 10%. Assume annual compounding of interest. Prepare the journal -
## math

in a group of 180 person composed of men, women and children there are twice as many men as women and three times as many women as children. how many are there each? -
## Algebra

A woman invests $15000 in 2 separate investment accounts. One account earns 5.1%, one earns 4.2% simple interest. If she earns $21 in interest total, how much did she earn from each account. I keep getting x to be 67,666.67 by getting to this equation: -
## Math

Eight-ninths of a bunch of marbles remain on a table. The square root of half the total number of marbles have rolled away. Also, the two children who are playing with the marbles each hold one marble. Find the total number of marbles in the bunch. -
## math

Jason took 3/4 of an hour to paint 27 1/3 square yards. How many square yards does he paint per hour? -
## physics

A bullet is fired through a wooden board with a thickness of 8.0 cm. The bullet hits the board perpendicular to it, and with a speed of +350 m/s. The bullet then emerges on the other side of the board with a speed of +210 m/s. Assuming constant -
## math

12.5= 3/k how do u solve k? -
## Lea408

can someone please tell me if I am right Like optical scanners, capacitance fingerprint scanners generate an image of the ridges and valleys that make up a fingerprint. But instead of sensing the print using light, the capacitors use electrical current. -
## Chemistry

a sulfuric acid solution that is 65.0 h2so4 by mass has a density of 1.55 g/mL. What is the molality of sulfuric acid in this solution -
## Data Management

In a multiple choice test that contains ten questions with each question having five possible answers, what is the probability that Colin will pass the test if he merely guesses at each question? -
## statistics

A test designed to check for sickle-cell anemia has an 85% chance of detection in that, if a person has the disease, there is an 85% chance that the test will be positive. And, if the person does not have the disease, there is an 85% chance that the test -
## statistics

A laptop computer manufacturer found that by improving their battery design, they could increase the time that the laptop computer could be used on a single charge. To verify this improvement, they compared a sample of 10 laptops installed with the -
## statistics

Five coins all balanced the same were tossed 150 times. Note that, while the coins are all balanced the same, they may or may not be fair coins. Since five coins were tossed, the possible number of heads for each toss could be zero through five. The -
## CRJ

1. Which of the following was an impact on policing as a result of WWII? (Points : 1) The Pendelton Act An increase in educational requirements for police A shortage of experienced officers The adoption of residency requirements for police Question 2. 2. -
## LEA201

Conduct an analysis of community policing with regard to the impacts pertaining to law enforcement administration. Thoroughly compare and contrast the aspects of community policing that are significantly influenced by the public interaction and political -
## LEA 201

Conduct an analysis of community policing with regard to the impacts pertaining to law enforcement administration. Thoroughly compare and contrast the aspects of community policing that are significantly influenced by the public interaction and political -
## statistics

Which of the following statements is correct? A. An extremely small p-value indicates that the actual data differs markedly from that expected if the null hypothesis were true. B. A large p-value indicates that the data is consistent with the alternative -
## Chemistry

What mass of NaOH is required to create 500 mL of a .4 M solution of Sodium Hydroxide(aq)? -
## math

Three times as many childeren as adults attended a concert on Saturday. An adult ticket is $7 and a child's ticket is $3. The theater collected $6000. How many people bought tickets? -
## Biology

Describe how enzymes affect chemical reactions and explain why this makes enzymes important to living things. I need help this will be on my test I am studying for. -
## math

how many ways can a 3 person subcommittee be selected from a committee of 7 people -
## math

using simple interest on a loan at 8.4% for one year making monthly payments. Find the APR on a $5000 loan. -
## Math

Heather has divided $8000 between two investments, one paying 8% and the other paying 6%. If the return on her investment is $550 how much does she have in the larger investment? -
## Math (probability)

Real Estate ads suggest that 50% of homes for sale have garages, 24% have swimming pools, and 11% have both. If a home for sale has a garage, what's the probability that it has a pool too? Write as a decimal. -
## Math

What is the cubic feet of a concrete slab 20ft x 30ft x 6" thick. -
## Math(reiny)

On the earlier questin would the speed be faster not slower? -
## Math

Over a fixed distance speed r varies inversely as time t. If the speed of a car is 30 mph when the time is 6 seconds what would the speed be of the car if the time was 4 seconds -
## physics

If a metal wire carries a current of 79 . 0 mA, how long does it take for 7.90 × 10 20 electrons to pass a given cross-sectional area anywhere along the wire? The fundamental charge is 1 . 602 × 10 − 19 C. Answer in units of s -
## math

How much paper is used for a label on a can of frosting. The height of the jar is 5 inches and the radius is 1.5 inches I did SA=2TTrh+2TTr^2 SA=2TT1.5(5)+2TT1.5^2 SA=15TT + 2TT2.25 SA=15TT=4.5TT SA=19.5TT SA=61.261 SA=61.3in^2 61.3in squared of paper was -
## physics

Consider a pendulum of length 4.720 m. The acceleration of gravity is 9 . 832 m / s 2 . a) What is its period at the North Pole? Answer in units of s 009 (part 2 of 6) 10.0 points b) What is its frequency? Answer in units of Hz -
## Math

Aubrey spent 2/7 of her money and gave 1/4 of the remaining money to her hungry parents. she had $120 left. How much did she have left?