# Posts by tony

Total # Posts: 1,003

**Please Help! Calculus **

Calculate the speed of a particle traveling in the xy-plane with position vector r(t)=(4-t^2,6t) at the point (0,12). a)2(sqrt13) b)6 c)4(sqrt13) d)52 e)sqrt2

**physics**

A copper Calorimeter of mass 150g,was half-filled with water of mass 300g and a temperature of 0°C.5g of ice of mass 0°C was added to the content, later some quantity of steam was passed into the mixture and the temperature rose by 20°C. Calculate the quantity of ...

**information Systems**

You thought that was already true, is your answer?

**information Systems**

within the next few 7-10 years, smartphones will become the single most important digital device we own. Discuss the implications of this statement?

**Mechanics**

The composite shaft ABCD is fixed between walls at A (x=0) and D (x=3L). The shaft has a solid steel core of length 3L and round cross section of uniform radius R. In the left third of the shaft (segment AB of length L) the steel core is surrounded by a copper sleeve of inner ...

**Mechanics**

The shaft BCD in the figure has length L and is composed of a homogeneous material with shear modulus G. The bar is fixed between walls at B (x=0) and D (x=L). The shaft has a round cross section, with outer radius changing along the length of the bar as defined by the ...

**Math**

an organization is selling raffle tickets for 20$ each. you purchase one of 500 raffle tickets. the prize for this raffle is 6000$. what is your expected winnings?

**pre-calc**

Find a cubic polynomial if p(0)=0 and p(2)= -4 and p(x) > 0 only if x > 4, find the cubic polynomial.

**pre-calc**

If p(-3) = p(-1) = p(2)= 0 and p(0) =6 find the cubic polynomial

**Mechanics**

Bar BC in the figure has length L, constant cross sectional area A, and is composed of a homogeneous material with modulus E. The bar is fixed between walls at B (x=0) and C (x = L). The bar is subjected to a variable distributed load per unit length, oriented in the direction...

**Mechanics**

The composite bar BCD in the figure is fixed at the wall B (x=0), and has constant cross sectional area A0. The bar is composed by joining, at section C, two segments (BC and CD) of equal length L. Segment CD is homogeneous, made of copper. Segment BC is obtained by joining ...

**Mechanics**

A blade is fixed to a rigid rotor of radius R spinning at ?rad/s around the vertical z-axis (see figure). Neglect the effects of gravity. The x-axis rotates with the blade, and the origin x=0 of the axis is located at the "root" of the rotating blade (i.e., at the ...

**Physics**

Two cars collide at an icy intersection and stick together afterward. The first car has a mass of 1100 kg and was approaching at 8.00 m/s due south. The second car has a mass of 850 kg and was approaching at 24.0 m/s due west. (a) Calculate the final velocity of the cars. (...

**Physics**

Two manned satellites approaching one another at a relative speed of 0.200 m/s intend to dock. The first has a mass of 5.50 ? 103 kg, and the second a mass of 7.50 ? 103 kg. Assume that the positive direction is directed from the second satellite towards the first satellite. (...

**World History**

Did you ever get the answers to this portfolio? I really need help with it. Thanks!

**math**

24,36

**Math- Discrete Functions**

Vanna has just financed the purchase of a home for $200 000. She agreed to repay the loan by making equal monthly blended payments of $3000 each at 4%/a, compounded monthly How much sooner would the loan be paid if she made a 15% down payment? How much would Vanna have saved ...

**Geometry **

I am trying to find out the measurement of a scalene triangle. Side a is unknown b is 107.38 and c which is the hypotenuse is 100.65. Please help

**algebra**

I want to fence a rectangular garden which measures 33 by 24 feet. If the fencing I want costs $4.50 per yard, how much will it cost me for the fencing if I want to leave a two foot opening for a gate? (I cannot buy fencing of less than one full yard.)

**ALGEBRA 1 HELP**

The description below represents Function A and the table represents Function B: Function A The function is 2 more than 5 times x. Function B x y -1 2 0 5 1 8 Which statement is correct about the slope and intercept of the two functions? Their slopes are equal but y-intercepts...

**ALGEBRA 1 HELP**

Henry is taking a medicine for a common cold. The table below shows the amount of medicine f(t), in mg, that was present in Henry's body after time t: t (hours) 1 2 3 4 5 f(t) (mg) 282 265.08 249.18 234.22 220.17 Greg was administered 300 mg of the same medicine. The ...

**ALGEBRA 1 HELP**

If f(x) = x ? 4, what does f(3) represent? The value of (x ? 4) when x = 3 The value of x when (x ? 4) = 3 The value of 3f(x) when x = 3 The value of f(x) when (x ? 4) = 3

**Science**

How to determine SiO2/Na2O ratio after mixing Na2SiO3 (SiO2=35%, Na2CO3=15%, water=50%) solutions?

**statistics**

The owner of a large office building is considering expanding the buildings' daycare center, which all employees of the the building can use and wants to know what the employees think of this idea. A survey is taken by giving a questionnaire to every parent/guardian of the...

**MATHS**

A car can cover a distance of 540 km on 18 liters of petrol. How far can it travel on 16 liters of petrol?

**Physics**

What is the weight (in Newtons) of a 98.17 kg mass?

**Algebra**

MathMate - yes - the answers all have x as the exponent which should be ^..... But regardless of that - you have not helped me in solution of this word problem... Can you assist or not ? And why would you ask me which answer is correct. IF I was able to come to that conclusion...

**Algebra**

A certain forest covers an area of 2,000 square kilometers. Suppose that each year this area decreases by 6%. What is the function that best represents the area of the forest each year and how much area remains after 12 years? Round your answer to the nearest square kilometer...

**Algebra**

Which of the following statements is false? The sum of two rational numbers is always rational. The sum of a rational number and an irrational number is always rational. The product of a nonzero rational number and an irrational number is always irrational. The product of two ...

**Algebra**

A wrestling match has eliminations each round. The table below shows the number of wrestlers in each of the first 4 rounds of the tournament: Round (x) 1 2 3 4 Wrestlers f(x) 64 32 18 9 Compute the average rate of change of f(x) from x = 1 to x = 4 and identify the meaning of ...

**Algebra**

Which of the following options results in a graph that shows exponential growth? f(x) = 0.4(3)x f(x) = 3(0.5)x f(x) = 0.8(0.9)x f(x) = 0.9(5)?x

**Algebra**

Which of the following options is an equivalent function to f(x) = 2(5)^2x? f(x) = 50x f(x) = 100x f(x) = 2(25)x f(x) = 4(25)x

**Math **

22% of Shirley's monthly salary is deducted for withholding if those deductions total $209 what did her salary

**trig**

To help a sapling (young tree) grow straight, a gardener attaches three guy wires to it and the ground. She places the wires two feet below the top of the tree. If the wires are ten feet long and each makes an angle of 58 degrees with the ground, find the height of the tree to...

**trig ratios'**

To help a young tree grow straight, a gardener attaches three guy wires to it and the ground. She places the wires two feet below the top of the tree. If the wires are ten feet long and each makes an angle of 58 degrees with the ground. Find the height of the tree.

**Algebra/Trig**

To ensure safety, the recommended angle that a ladder leaning against a building makes with the ground is 75 degrees. Will a 12 foot ladder reach a window 10 feet above the ground if it leans against the building with this angle? Use trigonometry to justify your answer.

**TRIG**

The length of a rectangle is 142.9 in. If the diagonal makes an angle of 32.1o with this side, find the measure of the diagonal of the rectangle rounded to the nearest tenth of an inch. let x represent the diagonal.

**Chemistry**

Please someone explain the best way of solving this. A 55 kg woman has 7.5 x 10 to the power of negative 3 moles of hemoglobin (Molar mass=64,456 g/mole) in her blood, how many hemoglobin molecules is that? What is the quantity in grams?

**science**

Two objects slide over a frictionless horizontal surface. The object A with a mass of 5000g is moves at a speed of 4.5m/s toward the object B (mB= 2500g) which is initially at rest. After the collision, both objects are directed to 30O on either side of the original line of ...

**science**

Write the structural formula of 2,3,5-trimethyl-4-propylheptane.

**science**

1 litre of coffee at 80oC need to be cooled to 40oC. Assuming that all the ice melts and no heat is lost to the environment. Take the specific heat capacity of coffee to be 4200J/kgK, density of coffee to be 1000kg/m3 and latent heat of fusion of water to be 3.34 x 105 J/kg. ...

**basic science**

1 litre of coffee at 80oC need to be cooled to 40oC. Assuming that all the ice melts and no heat is lost to the environment. Take the specific heat capacity of coffee to be 4200J/kgK, density of coffee to be 1000kg/m3 and latent heat of fusion of water to be 3.34 x 105 J/kg. ...

**math**

1 litre of coffee at 80oC need to be cooled to 40oC. Assuming that all the ice melts and no heat is lost to the environment. Take the specific heat capacity of coffee to be 4200J/kgK, density of coffee to be 1000kg/m3 and latent heat of fusion of water to be 3.34 x 105 J/kg. ...

**Physics**

The figure below represents a section of a circular conductor of nonuniform diameter carrying a current of 4.50 A. The radius of cross-section A1 is 0.300 cm. (a)What is the magnitude of the current density across A1? A: 1.59155e2 using J=I/((r^2)pi) (b) If the current density...

**Algebra**

I have to implify completely without writing complex fractions: (4y^-3/5x^-4)^2

**Long Division**

Need desperate help with this question! (x^3-13x-18)/(x-4)

**Math**

$5 per movie, + $3 per each late day. A movie that is 2 days late, then, is: $ ( 5 + 3 + 3) = $ 11 Now that we know the cost per movie, we need to know how many movies were rented. Total cost was 33. Each movie was 11. Then, 33/11 = 3 movies rented.

**Algebra Word Problem**

Solve algebraically using one variable: Find three consecutive odd integers such that the product of the first integer and the third integer is equal to nine more than twelve times the middle integer.

**Algebra**

The perimeter of a rectangle is 46 inches, and the area is 120 square inches. Find the length and width of the rectangle.

**Algebra**

Solve algebraically using one variable: Find three consecutive odd integers such that the product of the first integer and the third integer is equal to nine more than twelve times the middle integer.

**Algebra**

Solve algebraically using only variable: The length of a rectangle is two less than three times its width. If the area of the rectangle is 65, find the length and the width. (The area of a rectangle is equal to its length times its width.

**Math Algebra**

Solve algebraically using only variable: The length of a rectangle is two less than three times its width. If the area of the rectangle is 65, find the length and the width. (The area of a rectangle is equal to its length times its width.

**Algebra**

Find All Real Numbers 4x3 = 16x (4x cubed)

**Algebra**

One of the polynomials below cannot be factored using integers. Write “prime” for the one trinomial that does not factor and all the factors for the two that do. a) x2– 5x + 6 b) x2+ x + 6 c) 2x2– 2x + 12

**Algebra**

Solve the following algebraically using one variable: Find three consecutive even integers such that the product of the smallest integer and the middle integer is eight less than eleven times the larger integer.

**science**

A 2.4-kg pile of aluminum(? = 2.70 g/cm3)cans is melted, then cooled into a solid cube. What is the volume of the cube?

**Algebra**

Solve for B: 3b = a(B + b)

**Algebra Word Problem**

A student has grades of 87, 94, 89, and 92 on four of the five unit tests in a course. Let x represent the grade on the fifth test. This must be a whole number. An average, which can be a decimal, of more than 90 is desired. a) Using this information, write an inequality using...

**Algebra**

The sum of two different positive integers is 123. The larger integer is four more than six times the smaller one. What are the two integers?

**Spanish **

I was hoping some one could check these reading response answers for grammar. It was the story la dama del alba. En español, escribe un resumen de un párrafo relatando lo que ha pasado en las primeras 10 páginas de ‘La dama del alba’. (5 points) ...

**Math**

A recipe calls for 2 2/4 cups of raisins but Julie only has 1/4 cup measuring cup.how many 1/4 cups does Julie need to measure out 2 2/4 cups of raisins?

**Maths**

12 players to play a snooker game over 11 weeks . Who plays who each week?

**chemistry**

Diamagnetic

**physics**

Hello, could anyone help with this excersise of Harmonic Motion? I have to show that a block of mass "m" that is attached at the top of a frictionless inclined plane using a string of "k" constant , performs simple harmonic motion... Well doing the the ...

**Math**

A notebook costs 4 times more than a pencil. The pencil is 30gh less than the note book . What is the price of the pencil

**Math- integers**

I think it is one

**Math**

the half-life of iodine-131 is 8 days. how much iodine-131 will be left After 35 grams sample after 32 days?

**la**

when writing a personal narrative which point of view should you use

**Algebra**

Solve the following equation: 9z^2+34=36z The solutions are:

**Math**

Three numbers form a g.p.if the first and third numbers are 5 and 245 respectively, find two possible values for the middle number.

**Math**

Three numbers form a g.p.if the first and third numbers are 5and245 respectively,find two possible values for the middle number.

**Math**

Tickets to a concert cost $12 for adults and $8.50 for students. A total of 950 people paid $10175. How many adults were at the concert

**Geology**

Which of the following pieces of evidence supports the plate tectonic theory? A. Ocean-floor sediments are oldest at the ridge crest. B. The stripe patterns of high- and low-intensity magnetism are mirror images on both sides of an oceanic ridge. C. Ocean-floor sediments are ...

**Physics (Sound)**

Cellist Yo-Yo Ma plays a note at 250 Hz. A studio technician performs an analysis of the frequency spectrum and reports that she measured the SIL of its peaks (those of the frequency spectrum): 63 dB at 250 Hz, 58 dB at 500 Hz, 56 dB at 750 Hz, and 51 dB at 1000 Hz. Assuming ...

**Maths**

One number is 8 more than twice another number. Find the numbers if their sum is 50

**Maths**

Moss and Roy both decide to go out for a 2 course dinner. Moss' meal cost twice as much as Roy's meal, however Roy spent $3 more than Moss for his dessert. Moss spent $11 on his desert. The bill came to $75. How much did Roy spend for his meal and dessert?

**math**

What is the base in the power 9

**precalc**

Letf(x)=2x2 –5 and g(x)=x+4. (a) Find the composite function ( f o g)(x) and simplify. Show work. (b)Find (f og)(3).Showwork.

**precalc**

Suppose that cos θ = 12/13 and that θ is a Quadrant IV angle. (a) Find the exact value of sin θ. Show work. (b) Find the exact value of sin 2θ. Show work.

**precalc**

A projectile is launched from a platform 10 feet high with an initial velocity of 72 feet per second, The height h of the projectile at t seconds after launch is given by h = –16t2 + 72t + 10 feet.

**maths**

the sum of a number and its square is one and a half times their difference. what is the number?

**Math**

Thank you

**Math**

How do I work out this problem 8 3/4 + 2 1/2 please help me.

**Matt**

The area of a curved surface of a d battery with a diameters of 3.2 centimeters and a height of 5.6 centimeters h

**Calculus (Integration proving)**

Show that 0 <= [(integral)(integral, r to none)sin(pi)xcos(pi)y dA] <= 1/32 where R = [0,1/4]x[1/4]x[1,2]. Thank you.

**algebra**

The sum of 3 numbers is 24. Twice the smallest number is 2 less than the largest number and the largest number is equal to the sum of the other two. what are the three numbers?

**life orientation**

identity you 3 human rights violation

**Chem**

How many grams of oxygen are there exactly in 100.0 g of carbon dioxide?

**Math**

I think Patrick is right!

**Math**

but Matts house is the gray house because Justin lives next to math so we can assume that Matts house is grey.

**Mathematics**

A curve is defined parametrically x = 1 - √3 sin(2s) y = cos(2s-1) What is the gradient at s=(pi/6)

**Mathematics**

Parametric Equations x = 9s^2 - 1 y = 1 - 8s^3 Find the cartesian equation?

**Math**

Parametric Equations x = 9s^2 - 1 y = 1 - 8s^3 find dy/dx in terms of s find the coordinates of stationary points

**Mathematics**

Parametric Equations x = 9s^2 - 1 y = 1 - 8s^3 find dy/dx in terms of s find the coordinates of stationary points

**Math**

A blimp flies at 60mph. A round trip of 40miles into the wind and 40 miles with the wind takes 90 minutes. What is the speed of the wind?

**Calculus**

An object moves from left to right along a parabolic shaped path y=(1/4)x^2. At the point (-2,1) the speed is 1. What normal acceleration is the object experiencing at that point?

**physics**

A 82 kg runner with a speed of 5.6 m/s makes a sharp turn with a radius of 1.1 m to avoid a collision. What is the magnitude of the frictional force (in N) the ground exerts on the runner during the turn?

**physics**

A spring is stretched by 8 cm when a force of 2 N is applied. If a force of 5.8 N is applied, how many additional cm does the spring stretch? would it be 8/2 =4*5.8= 23.2

**math**

7 kids and 2 adults are going to the circus. Kid's tickets are on sale for only half the price of adult tickets. The total cost is $70. How much is one kids ticket? How much is one adult ticket?

**Physics**

Calculate the speed with which a swimmer enters water if she slides down a frictionless ramp that is 2.6 m high