# Posts by lindsay

Total # Posts: 620

**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 ...

**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 ...

**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?

**science please help me fast**

you are dumb if you do not know this answer

**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?

**Physics**

A bullet with a mass m = 4:83 g and initial speed of 330 m/s passes through a wheel which is initially at rest as in the The wheel is a solid disk with mass M = 2.29 kg and radius R = 1.:6 cm. The wheel rotates freely about an axis through its center and out of the plane shown...

**Math**

2.43x10^-4

**Physics**

A long thin rod of mass M = 2:00 kg and length L = 75:0 cm is free to rotate about its center as shown. Two identical masses (each of mass m = .403 kg) slide without friction along the rod. The two masses begin at the rod's point of rotation when the rod is rotating at 10....

**physics**

In order to change the angular momentum of an object, it is necessary to apply a. a net force to the object. b. a net torque to the object. c. a centripetal acceleration to the object. d. both a net force and a net torque to the object. We have three vectors, labeled A, B, and...

**MATH(ALGEBRA)**

yes

**Calculus**

an (2a-4)=2(a-2) or -2(2-a) which will cancel out your 2-a, then do the same for the 2a+4, and this should give you your answer

**Physics**

A star with the same mass and diameter as the sun rotates about a central axis with a period of about 29.2 days. Suppose that the sun runs out of nuclear fuel and collapses to form a white dwarf star with a diameter equal to that of the earth. Assume the star acts like a solid...

**Physics**

An airplane of mass 2180 kg located 131 km north of U is ying 272 km/hr in an easterly direction. (a) What is the magnitude of the angular momentum (kg m2/s) with respect to U? (b)what is the angular momentum with respect to U?

**Physics**

I got a) 1.36, b) 1.55e3 c) .938 all are incorrect please help

**Physics**

Calculate the position of the center of mass of the following pairs of objects. Use a coordinate system where the origin is at the center of the more massive object. Give your answer not in meters but as a fraction of the radius as requested. Get data from inside the front ...

**chemistry**

Thank you both for your help! You made it very clear

**chemistry**

When zinc metal is reacted with hydrochloric acid, zinc chloride and hydrogen gas are produced. If 16.4 ml of 2.14 M HCl are used: a) how many grams of zinc metal are needed to completely use up the acid? b) What will be the molarity of the aqueous product? Please show all ...

**chemistry! URGENT**

Thank you! That was a giant help, I understand now!

**chemistry! URGENT**

A standard solution is prepared for the analysis of fluoxymesterone (C20H29FO3), an anabolic steroid. A stock solution is first prepared by dissolving 10.0 mg of fluoxymestrone in enough water to give a total volume of 500.0 ml. A 100.0 micro liter aliquot (portion)of this ...

**chemistry**

Oh! Okay thank you, that's very good advice. I understand now

**Chemistry**

0.089g

**physics**

On an air track, a 403.0 glider moving to the right at 2.30 collides elastically with a 501.0 glider moving in the opposite direction at 3.00 .Find the velocity of first glider after the collision

**Math-Help-please?**

2. Based on the function D, what would be the total amount of nonfunctional components in 2014?let 1993 be represented by 0

**physics**

a horizontal force of 60.0 N is exerted on a 2.00 kg discuss as it is rotated uniformily in a horizontal circle (at arm's length) at radius of 1.00 m. Calculate the speen of the disuss

**Calculus**

Thanks!

**Calculus**

Find the Derivative of the function: f(x)= ln(x^2/2x-3)

**Calculus**

The price per unit is given by the equation p=18-2ln(x). What is the marginal revenue at x=400? And what should the number of units sold be in order to maximize revenue?

**statistics**

A survey was conducted to measure the number of hours per week adults spend on home computers. In the survey, the number of hours was normally distributed, with a mean of 8 hours and a standard deviation of 1 hour. A survey participant is randomly selected. Find the ...

**chem**

The mass of an electron is 9.11\times 10^{-31}~\rm kg. If the de Broglie wavelength for an electron in a hydrogen atom is 3.31\times 10^{-10}~\rm m, how fast is the electron moving relative to the speed of light? The speed of light is 3.00\times10^8 ~\rm m/s.

**Math**

In class we started operation with radicals how would you answer a question like this determine the length of the line segment from A(-2,7), to B (4,1)?

**Ochem**

A student needed to determine the percent composition of a mixture that contained fluorene and benzoic acid. The student took 283 mg of the mixture and used the extraction method to separate the components. Then both compounds were recrystallized and dried. The experiment ...

**CRT 205**

Can someone review this and let me know if it is acceptable?? This class was so hard and it has been all i can do to pass it! Here is the article i chose Addiction Is a Choice, Not a Disease Addiction , 2009 Content Level = Intermediate Dale Netherton, "It's Not ...

**Science**

How does elevation affect temperture

**english**

Thank you.

**english**

Looking for the simple subject. How much does it cost to fly to Spain? Is the subject it?

**Calculus**

Find the area of the region enclosed by y−2x^2 ≥ 0 and |x|+|y| ≤ 1

**statistics**

A sales firm receives an average of four calls per hour on its toll-free number. For any given hour, find the probability that it will receive exactly eight calls

**Spanish-7th grade-Please check**

1.I have to correct this sentence- Mi amigo viene de el cine. I think I rewrite it as Mi amigo viene del cine. 2. Ella va a el centro comercial. I think I correct it this way: Ella va al centro commercial. 3. Ellos dorem. I correct it by writing it this way: Ellos duermen. 4....

**english**

I put for my answer is A

**english**

Which of the following parts of speech is most often used with a noun to create a descriptive phrase? A. pronoun B. preposition C. averb D. conjunction

**math**

False

**Physics**

A quarterback claims that he can throw the football a horizontal distance of 183 m (200 yd). Furthermore, he claims that he can do this by launching the ball at the relatively low angle of 35° above the horizontal. To evaluate his claim, determine the speed with which this...

**AP European History**

Thank you so much! This helped me immensely.

**chemistry**

what is the length of an equilateral triangle when the area is 45 meters square?

**Chemistry**

Is it b)?

**Chemistry**

All amino acids (choose the correct choice) a) have the same side chains b) form zwitterions c) have the same isoelectric points d) show hydrophobic tendencies e) are essential amino acids

**Cell Biology**

What do the two steps of transcription followed by translation do?

**Math- help finishing**

A right triangle has an area of 84 ftand a hypotenuse 25 ft long. What are the lengths of its two sides? Ive gotten this far: 25^2= a^2+b^2 a=25-b 84= ab/2 168= 25b-b^2 b^2-25b+168=0 I then use the quad. formlua to solve for b... but I get an error. Can someone help me?

**Chem**

Please tell me if these are right? A mixture of oxygen and helium is prepared for a scuba diver that will descend to 125 feet below the ocean surface. At that depth the diver breathes a gas mixture that has a total pressure of 8atm. If the particle pressure of the oxygen in ...

**Chem**

A sample of nitrogen (N2) gas has a volume of 250ml at 30 degrees C and a pressure of 745mmHg. What is the volume of the nitrogen at STP? I got 22 liters in significant figures is this right. thank you.

**Chemistry**

Which compound has the formula HC(=O)-O-CH2-CH3?

**Chemistry**

Thanks a lot, J!

**Chemistry**

Draw the condensed structural formula for the products of the acid hydrolysis of the following amide with HCl: CH3-CH2-C(=O)-NH2 + H2O + HCl ---> I'm afraid I don't even know where to begin with this one, help!

**Chemistry**

I know that vanillin has the functional groups aldehyde, ether, and phenol. My assigment says there is a fourth. Which one am I missing?

**Chemistry**

Thank you!

**Chemistry**

So it should be a) correct?

**Chemistry**

**Sorry, c) was supposed to be butene.

**Chemistry**

Which one of these has the smallest # of hydrogen atoms? a) Butyne b) Butane c) Butyne d) Cyclobutane Is the answer c)?

**Algebra**

It says "Find the slope of each line" 10=-5x+2y 4x-3y=12

**arithmetic**

Find the sum of the first 40 terms of the arithmetic sequence. 19, 24, 29, 34

**Chemistry**

I am still a little confused, how did you get the .755(6.4+4.5)?

**Chemistry**

How much Ba(OH)2 is needed to neutralize 3.2 moles of H2SO4 and 4.5 moles of HCl mixed together in 755 mL of water?

**physics**

N-mg=mv^2/r N=6mg(given) 6mg-mg=mv^2/r 5mg=mv^2/r Cancel out the mass on both sides since it is common 5g=v^2/r Substituting the value of g and r G= 10m/s^2 r =20 m V= 31.6m/s

**Physics**

Impulse (N) = mv(final) - mv(initial)

**3rd grade**

sweetie, it's in the tenths place.(: