Saturday
April 19, 2014

Posts by ALan


Total # Posts: 320

Math
Evaluate the expression for the given value. x = 3; y = -5; z = -2 x(yz)^2 - 3(xyz)^0 + 2x^2yz^2 = 3(-5 * -2)^2 - 3(3 * -5 * -2)^0 + 2(3)^2(-5 * -2)^2 = 3 * 100 - 3 * 30 + 2 * 9 300 - 90 + 18 = 228

Please check this answer if this is correct.
-2(-2)^2 * 3 - 3(-2)(3)^2 * -1 - (-2)(-1) -2 * -4 * 3 - 3(-2) * 9 * -1 (-2)(-1) -2 * -4 * 3 - 6 * 9 * -1 * 2 24 - 108 = -84

Math
Evaluate the expression for the given value. x = -2; y = 3; z = -1 -2x^2y - 3xy^2z - xz =

Chemistry
In a double-stranded DNA molecule, the percentage of Guanine can never be more than ___%. Why?

Chemistry
Which of the following statements must be True? Check all that apply. The number of Adenines in single-stranded DNA equals the number of Thymines. The number of Guanines in single-stranded DNA equals the number of Adenines. The number of Thymines in double-stranded DNA equals ...

Math
Solve the following: -6x + 3 <= 25

Math
Solve the following. 2(x + 1) - 4 <= 1/4(12x - 24)

Math
Evaluate when x = 2, y = -5, z = 3. x^2 - y = 3 3z - 4(y + 1) - y^2 = 0 x - yz = -13

Math
Simplify or solve as appropriate. Enter ns if there's no solution or all if the solution is all real numbers. 2 - 3(x + 5)) = 10 X = -7.6 7z + 6 - 2(z + 3) 5 * z 1/2x - 5 = 3/4x + 7 X = -48

Math
Using the linear equation y = -3x + 5, complete the table of values (T-Chart) and choose the correct graph. X = -2 Y = _ X = -1 Y = _ X = 0 Y = _ X = 1 Y = _ X = 2 Y = _

Math
Using the linear equation y = 5, answer each of the following. Choose all points that would be on this line. (0,5), (5,5), (2,5), (5,2), (-3,5), or (5,-3)

Math
Find the x-intercept and the y-intercept of the linear equation 3x + 4y = 12. Write each intercept as an ordered pair.

Please check if these math questions are correct
8 = p - 5 Answer: p = 13 21 + y = 35 Answer: y = 14 6x = 54 Answer: x = 9

Math
Solve -4x is less then equal to -16. I got x is less then equal to 4. Is this correct I'm kind of confused with this question.

Math
Solve for X. X/8 = -4/9

Math
Evaluate the following expressions when x = -2, y = 6, and z = -4 y^2 + 3z 5y - 3(x^2 + 1) + z

Math
When driving to the beach, you drive 240 miles on 9 gallons of gas. When you arrive at the beach you fill up your gas tank. While there you drive 130 miles and use 5.8 gallons of gas. Round answers to 2 decimal places. What was your gas mileage driving to the beach? What was y...

Math
Choose True or False for each of the following. 87% is equivalent to 0.87 True or False 1.29 is equivalent to 129% True or False 0.5% is equivalent t0 0.05 True or False 5.6 is equivalent to 56% True or False

Math
Convert each of the following. Round your answer to two decimal places if necessary. 0.68 miles = 43084.80 inches 10259 feet = 3419 yards

Math
If a boat travels at 5 miles per hour, how many feet per second does it travel? Round your answer to two decimal places if necessary. 26400 feet per second

Math
Three friends go to their favorite seafood restaurant for dinner. They decide to order a crab cake appetizer. When it arrives there are only 2 crab cakes. What fraction of a crab cake will each friend get to eat? 3/2 Write the fraction as a decimal rounded to 2 decimal places....

Math
Your favorite chocolate chip cookie recipe makes 4 dozen cookies. Among the other ingredients, the recipe calls for > 1 cup of butter > 2 tsp vanilla extract > 3 cups of flour > 1/2 tsp salt You are asked to make 6 dozen cookies for a party. How much butter, vanill...

Math
Perform the indicated operation and simplify. 1. 1/4 + 1/3 = 2/3 2. 4/7 - 5/6 = 1/6 3. 3/5 * -4/7 = -12/35 4. 10/11 divided by 2/3 = 15/11

Math
Is 10.512 * 10^3 written in proper scientific notation? If not rewrite the number in proper scientific notation.

Math
You have a table in your living room with a round top that has a diameter of 2 1/2 feet. You would like to put a piece of glass over the top of the table to protect the surface. What is the area of the table top? (Use 3.14 for the value of pi). Write your answer as a mixed num...

Math
You pull into a gas station where the sign says the gas costs $3.679. To fill up your tank you need 20 1/2 gallons of gas. You plan to use your credit card to pay. Rounded to the nearest cent, what will the charge be on your credit card? $75

Math
Perform the indicated operation. Write your answer as a simplified fraction. 1. 1/3 + 0.25 = 7/12 2. 0.3125 - 1/4 = 1/16 3. -7/10 + 0.2 = -9/10

Math
Convert the following decimals to a simplified mixed number. 1. 0.33 = 1/3 2. 1.875 = 1 7/8

Math
You and your friend ordered a 12 inch pizza to split for lunch. How many square inches of pizza do you each get to eat? Round answer to 2 decimal places. 37.68 square inches

Math
You live 35 1/3 miles from your grandmother's house. You're workplace is 7 2/5 miles from your grandmother's house. If you drive by your grandmother's home on the way to work one morning, what is the total number of miles you drove that morning? Write your answ...

Math
Multiply each of the following. Write your answer as a simplified fraction. 1. 4/7 * 5 = 20/7 2. 15/28 * 7/9 = 105/252 3. -3 1/5 * 7/8 = -56/20

Math
Add each of the following. Write answer as a simplified improper fraction. 1. 3/25 + 8/35 = 61/175 2. 5 1/4 + 3 5/12 = 26/3 3. -4 1/2 + 2 2/3 = -19/6

Math
-3 7/16 = -41/16 = -2.56 25/13 = 1.92

Math
Convert the following fractions to decimals. Round to 2 decimal places if necessary. 1. 1/4 2. -3 7/16 3. 25/13

Math
Simplify each of the following. 1. 42/48 2. -15/35 3. 119/210

Math
Write as an improper fraction. 1. 7 3/5 2. -12 1/2 3. 41 4/6

Math
Write as a mixed number. 1. 13/11 2. -33/6

Physics
186

6th grade social studies
What series of events led to the end of Egypts power in the Nile River Valley?

History
How did having few industries affect southerners. Can someone please help me with this question

chemistry
How many moles of H2O are needed to react with 15.0g of CaO forming Ca (OH)2? CaO + H2O --> Ca (OH)2

Math (Please help ASAP?)
I have this weird question that has to do with linear equations (I think), and this is what it says. Let f(x) = 4x - 5 A. Find f(3) B. Find x when f(x) = -21 Can somebody help me understand this??

Math
The parabola, B, represents a shuriken's maximum throwing distance, which was 60 meters of the enemy ninja, A, from a height of 7 meters. Figure out the trait of the enemy ninja that can be observed from the ellipse formed by the shuriken, and figure out the maximum throwi...

Chemistry
N-type silicon (Si) has been produced by doping with phosphorus (P). The charge-carrier population based on electrical conductivity measurments is determined to be 3.091*10^17 carriers/cm3 at room temperature. 1. Calculate the doping level of P (how much P has been added to th...

Chemistry
A glass of composition 85% SiO2 - 15% K2O is to be surface strengthened by ion exchange. To this end, two identical specimens approximately the size and shape of credit cards are soaked for the same amount of time at 850∘C. Sample A is soaked in NaCl and sample B is soak...

Chemistry
Consider the heterogeneous equilibrium process shown below. C(s) + CO2(g) 2 CO(g) At 700.°C, the total pressure of the system is found to be 3.87 atm. If the equilibrium constant KP is 1.52, calculate the equilibrium partial pressures of CO2 and CO.

Algebra
What is x when 6(x+4)+4(x+5)=74

Algebra
What is x when 6(x+4)+4(x+5)=74

Algebra
Subtract. [2x/(x^2-y^2)]-[7/(y-x)] Thank you! :)

math
Lin-Yee is helping to set up a health clinic in Inuvik by collecting and shipping medical supplies from Calgary. She has found these shipping rates online: • regular rate: $2.10/lb • ship 101 to 500 lb, get a 20% discount • ship over 500 lb, get a 40% discount A...

math
A male moose is 2.6 m tall and 3.2 m long, with antlers that are 1.2 m across. An artist wants to carve scale models of the moose. She uses a scale factor of 1/30. a) What are the dimensions of the carvings to the nearest centimetre? b) How many carvings can she make using par...

math
The butcher shop sells a 3 lb package of chicken legs for $9.57. The supermarket sells chicken legs for $7.68/kg. Determine the price per kilogram that each store charges. Which store has the lower price per kilogram?

Pre-Calculus
A jet leaves an airport on a bearing of N 77* W and travels for 243 mi. It then turns and continues on a bearing of S 13* W for 104 mi. Find how far the jet is from the airport to 3 decimal places.

physics
Vf=Vi+at Vf=? Vi=19 m/s a=1.8 m/s^2 t=6.8 Vf is what are we are trying to find. So, Vf=(19 m/s)+(1.8 m/s^2)x(6.8s) Vf= 31.24 m/s But because of significant figures, our final answer would be 31 m/s.

math
Are those negative signs or subtraction signs? Just follow BEDMAS, Brackets, exponents, division, multiplication, addition subtraction. Do all those in that order and you should get the right number. It does not matter if you do Multiplication or divsion first.

math
how do i put 3.00x10 to the 8th into a calculator

Algebra
how do you use a table to find a solution to 4m - 5 = 11

compound interest
If I invest $30000 at 10% compound interest for eighteen years how much will i get

geometry
A cone is created from a paper circle with a 90° sector cut from it. The paper along the remaining circumference of the circle is the base of the cone. Find the radius of the base of the cone. Round to the nearest hundredth.

Calculus
Sketch the graph of f(x)=(x^2 + 2)/x^2 - 4. Fund the vertical and horizontal asymptotes, the critical points, the points of inflection and the concavity.

Calculus
Sketch the graph of f(x)=x+2/x-4. Find the vertical and horizontal asymptotes, critical points, concave up/down, and inflection points.

Calculus
Sketch the graph of f(x)=-x^4 + 4x^3 - 16x + 16: Find the critical points, concave up/down, inflection points, vertical asymptotes and horizontal asymptotes.

Calculus
Find the price elasticity of demand. The demand function for the product is p=40-2x

Calculus
Find the relative extrema and absolute extrema if any. Use the first derivative test for the function f(x)=x^3-3x+2

Calculus
Find the equation of the tangent line to the graph of √(xy)=x-2y at (4,1)

Calculus
Find the points at which f(x)=x^2(x+1)^3 has a horizontal tangent.

Chemistry
What amperage is required to plate out .250 mol Cr from a Cr+3 solution in a period of 8.00 h?

math
a rectangular security area is enclosed with 200 ft of fencing. if this rectangular area is arranged so that the ratio of the length to the width is 5/3, find the dimensions.

Econ
The New York Times cost $0.15 in 1970 and $0.75 in 2000. The average wage in manufacturing was $3.23 per hour in 1970 and $14.32 in 2000. a. By what percentage did the price of a newspaper rise? b. By what percentage did the wage rise? c. In each year, how many minutes does a ...

Port st lucie
Can you help me find a link that tells me some information on history of Port St Lucie? Please answer if you see this.

Calculus
If 27 J of work are needed to stretch a spring from 18 cm to 24 cm and 45 J are needed to stretch it from 24 cm to 30 cm, what is the natural length of the spring?

calculus
find the rms value of the function i=15(1-e^-1/2t) from t=0 to t=4

Physics180
we dont know the mass of the astroid, how do we use the equation you have provided?

Physics180
Tidal forces can break apart objects that orbit too close to a planet, producing rings like those of Saturn. Consider an asteroid 600km in radius, 65mm from Saturn's center. What's the difference in gravitational acceleration between the two sides of the asteroid?

physics
A simple harmonic oscillator has spring constant = 8.8N/m , amplitude = 11cm , and maximum speed 4.6 m/s. what is the speed at x=6cm?

Physics
A spring with k=42N/m is mounted horizontally at the edge of a 1.2m high table. The spring is compressed 5cm and a 25g pellet is placed at its end. When the spring is released,m how far horizontally from the edge of the table does the pellet strike the floor?

Statistics
A young guy is setting up a date for his girlfriend. He has the option of going to Chicago, Indianapolis, or staying in Lafayette. If he chooses Chicago, he has 10 choices for a play and 100 choices for a restaurant. If he opts of Indianapolis, he has 5 choices for a play and ...

math
Wonderful help. Thank you.

math
Thanks for your help, I guess we took different approaches to this so now I'm a little confused. Is it possible to explain a little clearer?

math
From an observation tower that overlooks a runway, the angles of depression of point A, on one side of the runway, and point B, on the opposite side of the runway are 6 degrees and 13 degrees, respectively. The points and the tower are in the same vertical plane and the distan...

Math
From an observation tower that overlooks a runway, the angles of depression of point A, on one side of the runway, and point B, on the opposite side of the runway are, and , respectively. The points and the tower are in the same vertical plane and the distance from A to B is 1...

math
Yes but why is it 45 degrees? I'm dividing 8 into 16 = .5 then cos-1 .5 = 60. Nothing I do is giving me 45 degrees. Hope you get notified when a thread is updated, I'm inclined to repost this incase. Thanks again for your great answering.

Mathematics
thank you

Mathematics
Hi, Can someone check this for me .. please A tuning fork has a wavelength 0f 136 centimetres. Given that the speed of sound is 340 metres per second what is the frequency of the tuning fork ?? Frequency = speed / wavelength Then 340 / 1.36m (136cm) = 250 Hz Thank you try to h...

math
2/27(x-3)√((x^2-6x+23)/y)rearrange the equation to make y the subject

algebra
collect all like terms 3x^2-5x^2+12y-3y+8x =-2x^2+9y+8x

Alegbra 1
the answer is distance over time. total distance is 1500 miles total time is 3.5 hours. 1500/3.5=428.57 mph.

maths
(a)(i)use the composite rule to differentiate the function f(x)=(x^2-6x+23)^(3/2). (ii)use the composite rule and your answer to part (a)(i) to show that the function g(x)=(x-2)/(x^2-6x+23)^(3/2) has derivative g'(x)=(5+9x-2x^2)/(x^2-6x+23)^(5/2). (iii)find any staionary p...

physics
An inflated basketball has a gauge pressure of 9.0 lb/in^2. What is the actual pressure inside the ball?

physics
A 70 kg person sits on a 3.6 kg chair. Each leg of the chair makes contact with the floor in a circle that is 1.5 cm in diameter. Find the pressure exerted on the floor by each leg of the chair, assuming the weight is evenly distributed.

calculus
An airplane at a height of 2000 meters is flying horizontally, directly toward an observer on the ground, with a speed of 300 meters per second. How fast is the angle of elevation of the plane changing when this angle is 45 degrees?

Physics
Pushing on the pump of a soap dispenser compresses a small spring. When the spring is compressed 0.55 cm, its potential energy is 0.0035 J. What is the force constant of the spring? What compression is required for the spring potential energy to equal 0.0094 ?

physics
You raise a bucket of water from the bottom of a deep well. If your power output is 128 W, and the mass of the bucket and the water in it is 6.00 kg, with what speed can you raise the bucket? Ignore the weight of the rope.

physics
Never mind, i figured it out.

physics
A new record for running the stairs of the Empire State Building was set on February 3, 2003. The 86 flights, with a total of 1576 steps, was run in 9 minutes and 33 seconds. If the height gain of each step was 0.20 m, and the mass of the runner was 68 kg, what was his average...

physics
A 1.1 kg block is held against a spring of force constant 2.0×10^4 N/m, compressing it a distance of 0.20 m. How fast is the block moving after it is released and the spring pushes it away? v=____m/s

pyhsics
never mind, i figured out how to do this problem 1. K = 11J 2. v = 9.1m/s 3. W = 14J the wording was just alittle bit confusing

pyhsics
At t= 1.0s, a 0.61 kg object is falling with a speed of 6.0 m/s. At t= 2.0s, it has a kinetic energy of 25 J. 1. What is the kinetic energy of the object at t= 1.0s? 2. What is the speed of the object at t= 2.0s? 3. How much work was done on the object between t= 1.0s and t= 2...

Physics
A small plane tows a glider at constant speed and altitude. If the plane does 2.00X10^5 J of work to tow the glider 165 m and the tension in the tow rope is 2660 N, what is the angle between the tow rope and the horizontal?

physics
A 55-kg packing crate is pulled with constant speed across a rough floor with a rope that is at an angle of 44.7 degrees above the horizontal. If the tension in the rope is 155 N, how much work is done on the crate to move it 9.0 m? *looking for W=__J

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