Thursday

April 24, 2014

April 24, 2014

Total # Posts: 577

**math**

find the exact value of [sec(-30 degrees)- cot 120 degrees]/1-cosec^2(45 degrees) Find the exact value of [sin^2(355 degrees) + cos^2 (355 degrees)]/ tan^2 (30 degrees)

**math**

This is a matrix question. R is the matrix (3r 1) (s 2s) 1. State, in terms of s and r the determinant of R 2. If r=1/3 and s=4 determine the inverse of R 3.State the pair of r and s not including 0, which would make the matrix R a singular matrix

**math**

This is a matrix question. R is the matrix (3r 1) (s 2s) 1. State, in terms of s and r the determinant of R 2. If r=1/3 and s=4 determine the inverse of R 3.State the pair of r and s not including 0, which would make the matrix R a singular matrix

**math**

This is a matrix question but I can't get a single bracket so I will use two. (a b)(5 1) =(12 -2) (3 0)(-2 4) (15 3) Find the values of a and b.

**math**

A sequence is generated by the recurrence relation Ur+1 = 1/Ur -3. Given that U2 = U1 find the possible of U1

**math**

a species of orchid is being studied. The population 'p' at time 't' years after the study started is assumed to be p = 2800ae^0.2t/1 + ae^0.2t where 'a' is a constant. Given tnat there were 300 orchids when the study started. a. show that a =0.12 b. us...

**trigonometry**

A sector AOB of a circle, centre O, radius r cm, where the acute angle AOB is theta radians. Given that the perimeter of the sector is 14 cm and that the area of the sector is 10 cm^2, evaluate r and theta.

**Economics**

We're looking at the market for cat food. When the price is $10, the quantity sold is 1000 bags. When the price drops 10%, the quantity sold increases 30%. Calculate the price elasticity of demand. (Answer in format X.XX, round to the nearest hundredth.) I know the formula...

**math**

Can you explain how I find the values so I can plot a graph of T=(25 ln24/ln) -(25/ln2) ln M

**SOC203**

Not the answer it gave on weegy!!

**math 11**

Current price is $100, current salesbare 5000 units. For every increase in price of $1, sales decrease by 20 units. Find optimum revenue.

**algerbra 2**

3. Write the function R that models the total number of components that reenter the atmosphere around the earth each year.

**math**

Calculat the absolute value of: 4-{x-3}=0 PS. The brackets are supposed to be the straight lines for the absolute symbols.

**math**

Hi Reiny, I did not get any parentheses with the question. I got it the way I typed it. Thanks.

**math**

If f(x)=2x+1/x-3 and g(x)=1-x/2 Show that f(g)(x)=g(f)(x)

**math**

Given that h(x)=x+1/x-2 and g(x) =4-x. Find h(g)(x) and find g(h)(x). P.S. Thanks for the correction Steve.

**math**

Given that h(x) =x+1/x-2 and g(x)=4-x. Find hg(x) and find gh(x)

**math**

Find the range of values of 'c' for which g(x)= -3x^2-4x-c has complex roots

**math**

The function f:x =2x+1/x-3 and g:x =1-x/2 a. For what value of x is 'f' undefined? b. Find 'f' inverse and hence solve f(x) =1/3. c.Show that fg(x) -gh(x).

**math**

I need to sketch the graph of t(x)=2x^2 +3x > or equal to 10x-x^2. How do I work out the points to plot on the graph?

**math**

Write 2x^2+6x-5 in the form of a(x+h)^2 +k where a,h,k, are real numbers.(using completing the squares)

**math**

A motorist travelling at a steady speed of 120km/h covers a section of the highway in 30min. After a speed limit is imposed he finds that when travelling at the maximum speed allowed he takes 20 min. longer than before to cover the same section. Calculate the speed limit.

**math**

A rectangular pool's depth is 1m at the shallow end and gradually increases to 4m at the deep end. The pool is 32m in length and 12m width. 1. calculate the total surface area (m squared) of the pool. 2. The cost of painting the pool at $5 per square foot. 3. the amount of...

**math**

Sorry, the diameter of 20cm and height of 8cm is for the cylinder.

**math**

A paperweight containing liquid is made up of a cone and a cylinder. The radius of the cone is 3cm with height of 4cm. The diameter is 20cm and height is 8cm. 1. Calculate the total volume of the cone and cylinder when it si empty, leaving your answer in terms of pi. 2. If the...

**math**

A fish tank is 50 cm long, 34 cm wide and 24 cm high. It contains water to depth of 18 cm. Four identical spheres are placed in the tank and are fully submerged. The water level rises by 4.5 cm. 1.What is the volume before the spheres were added? 2. What is the volume of each ...

**Math**

A recipe for cake calls for 5 and 1/4 cup of flour. The chef mistakenly adds 7 and 2/3 cups of flour to the mixture. How much flour does the chef need to remove from the mixture?

**math**

Can 0/3 + 3 be simplified? Can 10m + 1 / 10 be simplified?

**math**

Maria ran 3 and 4/5 miles. She ran 1 and 2/3 miles further than Paul. Write the equation.

**math**

a cyclist travels the 30 km from Town A to Town B at an average speed of 25 km/h and immediately continues the journey to town C, which is a further 60 km away at an average speed of 20 km/h. What is the average speed for the whole journey?

**math**

1.John deposited $40,000.oo in the bank and earned simple interest of 7% per annum for 2 years. calculate the amount he will receive at the end of the 2 year period. 2. Find the simple interest on $15,000.00 invested for 4 years at 12% per annum.

**math**

An article can be bought for cash at $20,000.00. A customer bought it on hire purchase by paying a deposit of 20%. An interest of 10% was charged on the remaining balance and he was required to pay the balance in 15 monthly installments. 1.What is the interest charged? 2.The a...

**math**

Consider the relation R = (a,b),(a,c),(c,c),(b,b),(c,b),(b,c) on the set A = a,b. Is R reflexive? Symmetric? Transitive? and why or why not.

**Physics**

what else elena...???

**geology**

Granite 585 Gabbro 1843 Gneiss 3660

**physics **

A 58.4-kg person, running horizontally with a velocity of +3.84 m/s, jumps onto a 10.7-kg sled that is initially at rest. (a) Ignoring the effects of friction during the collision, find the velocity of the sled and person as they move away. (Indicate the direction with the sig...

**Physics **

A jet is circling an airport control tower at a distance of 23.0 km. An observer in the tower watches the jet cross in front of the moon. As seen from the tower, the moon subtends an angle of 9.49 10-3 radians. Find the distance traveled (in meters) by the jet as the observer ...

**Geology**

Granite 585 Gabbro 1843 Gneiss 3660

**math**

How to solve 13 is 10 percent of what number?

**Physics**

An artillery shell is fired with an initial velocity of 300m/s at 55.0 degrees above the horizontal. To clear an avalanche, it explodes on a mountainside 42.0s later. What are the x and y coordinates of the shell where it explodes, relative to its firing point? a) (1.68km, 7.2...

**Physics. Really stuck!**

two blocks of masses m1 and m2 (m1>m2) are placed on a frictionless table in contact with each other. A horizontal force of magnitude F is applied to the block of mass m1. if P is the magnitude of the contact force between the blocks, what are the net forces acting on m1 an...

**chemistry**

How many photons are produced in a laser pulse of 0.324 J at 631 nm?

**chemistry**

To resolve an object in an electron microscope, the wavelength of the electrons must be close to the diameter of the object. What kinetic energy must the electrons have in order to resolve a protein molecule that is 8.10 nm in diameter? Take the mass of an electron to be 9.11&...

**English**

List the compound nouns in this sentence. Philo T. Farnsworth was the first American inventor to use television technology. The answers were Philo T Farnsworth, American inventor, and television technology. Can a proper noun also be a compound noun?

**PHYSICS **

A car is safely negotiating an unbanked circular turn at a speed of 29 m/s. The road is dry, and the maximum static frictional force acts on the tires. Suddenly a long wet patch in the road decreases the maximum static frictional force to one-ninth of its dry-road value. If th...

**Math. Due in 4 hours. Please helpp!**

A female moth lays nearly 150 eggs. In on year there may live up to five generations. Each larva eats about 20mg of wool. Assume that 2/3 of the eggs die and that 50% of the remaining moths are females. Estimate the amount of wool that may be destroyed b the descendants of one...

**i don't get it**

thanks

**i don't get it **

why does everybody not like a teacher's pet?

**math**

What ia A inverse if A = (3 -2) (3 2)

**math**

Solve the inequality 2x^2<12-5x

**math**

Solve the equation 3^2x - 12 x 3^x + 27 = 0

**math**

simplify the following giving your answer with a rational denominator, 2 root3 - root 3/ 2 + root three.

**Trigonometry**

1. ((cosx)/(1 + sinx))+((1 + sinx)/(cosx)) 2. ((cos(x)cot(x))/(1 - sin(x)))-1

**math**

solve: n squared + 5n = 84 for n?

**physics**

to start a nuclear fusion reaction, two hydrogen atoms of charge 1.602x10^-19 and mass 1.67x10^-27kg must be fired at each other. If each particle has an initial velocity of 2.7x10^6m/s when released, what is their minimum seperation?

**physics**

a square with side length 2.0 cm has a charge of -1.0x10^-6C at every corner. What is the magnitude and direction of the electric force on each charge? What is the force on a fifth charge placed in the centre of this square? Does the sign of the fifth charge affect the magnitu...

**physics**

a metal ball with a charge of 5.4x10^8 electrons is touched to another metal ball so that all the excess electrons are shared equally. What is the final cahrge on the first ball?

**Math**

g(x)= -3x^2 g(f(x))= -3(x^2-4)^2 -6(x^2-4)(2x) -6x^2-24 (2x) -12x^3-48x -12x(x^2+4) f(g(x))= (-3x^2)^2-4 2(-3x^2)(-6x)-4 -6x^2(-6x)-4 36x^3-4 4(9x^3-1)

**geometry**

Given that P=(2,10) (5,-3) a. Evaluate the inverse P^-1, of P b. use a matrix method to solve x(2,5)+ y(1,-3) =(7,1)

**geometry**

The towns A and B are on the circle of latitude 24 degrees N.The longitude of A is 108degrees E and longitude B is 75 degrees E. a. Calculate the radius of the circle of latitude 24 degrees N. b.The shortest distance between A and B measured along the circle of latitude 24 deg...

**geometry**

The points A=(1,1) B=(3,4) connects to point C (3,1). a. Find the length of AB b. The gradient and equation of line AB

**geometry**

R =(cos0 -sin0) (sin0 -cos0) State the matrix R for 0=120 degrees NB 0 represents theta

**measurement**

Find thde total surface area of the net of a square pyramid given that the base is 3cm by 3cm and each slant edge is 5cm. Include the flaps.

**measurement**

A cylindrical container has an interior diameter of 21 cm. It can hold 6.93 liters of liquid. Find its height take Pi=22/7

**measurement**

A trailer driver left Miami at 15:45 and arrived at his destination 637.5 km away at 02:15 the next day a. How long did the journey take? b. What was his average speed in km/h c. What was his speed in ms^-1?

**trigonometry**

I need help in understanding how to identify which identity to use. using this question as an example. Show that tan theta (sin theta+cot theta cos theata)all over cos theta = sec^2 theta. Please explain.

**trigonometry**

In the triangle ABC, the sides AB and BC have lengths 7cm and 8cm respectively, and angle B is obtuse. the area of the triangle is 14 root 3 cm^2. Find a.The size of angle B b. The length of AC

**trigonometry**

Find all the solutions of x,for 0 is less than x is less than 2 pi a. Sin(x + pi/4 + sin(x - pi/4)= -1 b. Sin(1/3 x+5) = 1/2

**trigonometry**

Find all the angles between 0 degrees and 360 degrees which will satisf y the equation: 5tan^2 y +5 tan y = 2 sec^2 y

**trigonometry**

Given that tan A = 2 tan B (B is the symbol for Beta) show that tan (A-B) = sin 2B/3- cos2 Beta.

**trigonometry**

solve the equation: 4 tan^2 x + 12 sec x +1 =0, for 0 degrees is less than or equal to x is less than or equal to 360 degrees.

**geometry**

Find the coordinates of the center and the radius of a circle with and equation of: a. x^2 + 2root7x +7 + (Y-root 11)^2 =11 b. x^2 -12x + 84 =-y^2 + 16y

**geometry**

Find the coordiantes of the center and the radius of each circle a. (x+root5)^2 + y^2 -8y =9

**geometry**

Write an equation for each circle if the coordiantes of the center and length of the radius are a. center(-1,-5) radius = 2 units b. center(0,3) radius = 7 units c. center(-9,7) radius = 1/2 units

**geometry**

the diagonal VY of a cuboid =root(26.25)cm, the length of a side ZY = 4cm and the height of a sideUZ =25cm for the cuboid. Find the width of the width UV.

**geometry**

a closed box of uniform thickness is made of wood 1cm thick. Its extenal dimensions are 6cm and 5 cm by 4 cm. Find the a. volume of the wood used in making the box. b. the capacity of the box, given that the cover is full length and full width c. The interior surface area if t...

**trigonometry**

show that sin 2theta/1-cos 2 theta = cot theta

**trigonometry**

Find the general solution for f(x) = 27 tan^2 x-9=0

**trigonometry**

Solve the equation 6 cos x^2+sin x=4 if 0 is less than or equal to x is less than or equal to pi

**trigonometry**

Hal walked from point A to point B due north east from a distance of 20m. He immediately changed direction and walked 50m from B to C on a bearing of 110 degrees. 1. calculate the distance AC 2. Find the bearing of C from A

**trigonometry**

two pieces of wire stretched from the top, M of a vertical pole to the points L and N on the horizontal ground. the angle of depression of L from N =65 degrees. N is on the opposite side of the pole(from left)at an angle of depression of 72 degrees from M. Find the length of e...

**trigonometry**

Find all the angles between 0 degrees and 360 degrees which satisfy the equations a. 8 cos x sin x = sin x b. 5 tan^2 y + 5 tan y = 2 sec^2 y.

**trigonometry**

state the amplitude, period and phase shift of the function y = tan (2 theta- 180 degrees)

**trigonometry**

The function should read y = tan(2 theta - 180 degrees).

**trigonometry**

state the amplitude, period and phase shift of the function y=tan (20-80 degrees)

**trigonometry**

express 3 cos x -2 sin x in th eform R cos (x + a) and hence write down the maximum and minimum values of 3 cos x - 2 sin x.

**trigonometry**

a ship travels 8km due north then 7km on a bearing of 070 degrees 1. draw a diagram to represent the information 2. calculate the distance and bearing of the ship from its starting point

**trigonometry**

given triangle ABC with AB=7cm, BC=8cm and AC=9cm calculate 1. the size of the largest angle 2. the area of the triangle

**COLLEGE CALCULUS. HELP!**

the fundamental theorem of calculus, f(x)=∫(0,x) t^3+2t^2+2dt, and find f"(x). my answer was: f'(x)=x^3+x^2+2 f"(x)=x^4/4 + 2x^3/3 + 2x it said its wrong.

**anti-derivative help!!**

i mean i got stuck with f(pi/5)

**anti-derivative help!!**

Given f"(x)=-8sin3x and f'(0)=-1 and f(0)=-6. Find f(pi/5). i got stuck with f(pi/f) f"(x)=-8sin3x f'(x)=8cos3x+c f'(0)=8cos3(0)+c=-1 c=-9 f'(x)=8cos3x-9 f(x)=-8sin3x-9x+c f(0)=-8sin3(0)-9(0)+c=-6 c=-6 f(pi/5)-8sin3(pi/5)-9(pi/5)-6. so am i right?

**calculus anti-derivation**

Given that the graph of f(x) passes through the point (2,5) and that the slope of its tangent line at (x, f(x))is 3x+5, what is f(3) ?

**chemistry**

Write the expression for Kc and Kp for the reaction PH3BCl3(s) <==> PH3(g) + BCl3(g)

**calculus**

I'm trying to find the intersection point of y=x-2 and y=sqrt(x). I tried letting both equations equal each other but kept coming up with the points (4,1) and (1,4) however these aren't right as the answer should be (4,2) but I am unable to get this answer. Help please?

**Physics**

By what factor is the resistance of a copper wire changing when its temperature is increased from 20 degrees Celsius to 120 degrees Celsius? The temperature coefficient of resistivity for copper = 3.9 x 10^-3 (C)^-1.

**spanish**

This is on demonstrative adjectives and are fill in the blanks. ____ pantolones son bonitos y el precio no es muy alto. Si, las dos cosas son geniales. Tambien me gustan ____ sueteres que estan cerca de ti. ?De que talla es _____ sueter negro, el de solo un color?

**geometry**

Triangles Rst and wxy are similar . the side lengths of rst are 10 inches. 14 inches and 20 inches and the length of an altitude is 6.5 inches. The shortest side of wxy. Find the lengths of the other two sides of wxy. Find the length of the corresponding altitude of wxy.

**Physics**

Got it ALL NEVER MIND...

**Physics**

Please help I figured out part b put part a I get 1.45 and it is supposed to be 1.84

**Physics**

(a) What is the angular speed (rad/s) of the wheel just after the bullet leaves it? (b) How much kinetic energy (J) was lost in the collision?

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