# Posts by jane

Total # Posts: 1,651

**chemistry**

how many grams of Zn metal would you use to prepare 6.8g of zinc chloride according the reaction: Zn(s)+2HCl(aq)-> ZnCl2(aq)+H2(g)

**trig**

Find all solutions in the interval [0,2π) for cos(x - π/6) = 1 + cos(x + π/6). Show work, please and state in solution set.

**Trig please**

The height h in inches of pistons 1 and 2 in an automobile engine can be modeled by h1 = 3.75sin(733t) + 7.5 and h2 = 3.75sin[733(t+ 4π/3)] + 7.5 where t is measured in seconds. How often are these two pistons at the same height? Show work please.

**Trig**

Given sin= -√5/6 with π < u < 3π/2 and cos v= √3/5 with 0 < v < π/2 find sin(u-v) and tan(u+v). Please show work and simplify.

**Trig application**

A man is holding a gun 4 feet above the ground and fires into an open field. The bullet has an initial velocity of 300 feet per second and an initial angle of 30°. Find the range (the horizontal distance traveled before hitting the ground ) and the bullet's max height...

**Trig application**

I'm having trouble with this trig application. The scenario goes: A ferris wheel has a diameter of approximately 65 meters. Assume it takes 110 seconds for the ferris wheel to make one complete rotation. find the angular speed of the ferris wheel in radians per minute and ...

**Social studies**

Don't be rude Ms. Sue. She's just trying to get help. Don't say things about, "Don't waste our time." It's people like you that make suicide a number one cause of death facing teens today. So don't be mean, just kindly tell her no and give a ...

**triggggg help**

Please help me find all solutions in the interval [0, 2π) for these equations: 1) sin^2 x cos x = 4 cosx 2) 1 - cos x = √3 sinx I need help.

**Calculus**

A rectangle is bounded by the x-axis and the semicircle y = sqrt(36-x^2). What length and width should the rectangle have so that its area is a maximum? I understand that 2xy = A and that 4x + 2y = P, but I'm not sure how to solve for a variable to plug back into the ...

**Biology**

10. A

**english**

dyslexia-'please describe a typical reaction'

**Health and Physical Ed**

oxygen...is right

**Trig application**

Can anyone help me with this problem? I'm so confused. Please help. A security camera is placed 27 feet from the counter at a store. The counter is 18 feet long and the camera is placed 4 feet from one end. What angle, to the nearest degree, should the camera rotate ...

**Trig identity inverses**

Thanks so much! I'm starting to get it. :)

**Trig identity inverses**

Find the exact value of cos[cot^-1 (-√3) + sin^-1 (-1/2)]. I'm having trouble with inverses. Please help by showing work.

**Physics**

A stone is thrown vertically upward at an initial speed of 10m/s. Find the total time of the flight and the maximum height reached by the stone.

**Physics**

A tennis player throws a tennis ball vertically up with an initial velocity of 50m/s. Another player catches the ball after 0.43s. Find the time upward, time downward, and the vertical distance upward.

**Science**

If a crate with 350N is pulled so that the crate slides at a constant velocity what is the friction force?

**Health and social Care**

What is the meaning of Promoting choice and an example of how this empowers service users? And why is it important to take individual circumstances into consideration when planning care that will empower service users? ( in a nail painting activity; link back to first question...

**Science**

thank you! it's inorganic sources.

**Science**

Organisms designated autotrophs obtain their energy from: other producers. dead consumers. decomposers. inorganic sources. i think it's all of these.

**triggggg help**

Let cos 67.5° = [√(2(+√2)]/2, find tan 67.5°. Show work and simplify. I'm not too sure if i'm doing this correct. I know that the given is cos 67.5° = [√(2(+√2)]/2 sin^2 x + cos^2 x = 1 x=67.5° sin^2 67.5° + cos^2 67.5°...

**Please help me with trig.**

One more problem.. Given sin t= 3/11 and cos t<0, find the values of the remaining 6 trig functions.

**Please help me with Trig**

Given cos 67.5° = [√(2+√2)]/2, find tan 67.5° , simplify where needed, and show work. I'm starting to learn this stuff, and I'm so confused where to start. I know they gave me the coordinate X as in cos 67.5° = [√(2+√2)]/2, and I ...

**Maths litracy,tourism,business studies and history**

YOH GUYS PLZ HELP ME I WANT TO BE ARE C.E.O OF MILITARY AND I CHOOSE HISTORY TOURISM MATHS LITRACY BUSINESS STUDIES

**organic chemistry**

I can't get the answer. Can anyone help?

**organic chemistry**

m/mm* n(H+) + [HCl] * Va*n(+)+) = [NaOH]*Vb*n(OH) 0.68g/mm*2 + [0.02M]*0.025L*1 = [0.5M]*0.03L*1 PO4=mol

**organic chemistry**

0.68g of a solid diprotic acid was dissolved in 30.0mL of a 0.50 NaOH sol'n. the resulting mixture was then back-titrated against 0.20 M HCl; 25mL were required. Calculate the molar mass of the acid. This acid is a solid salt of a triprotic acid, identify this acidic salt.

**Physics**

3.34*10^17

**Physics**

An object moves with acceleration given by a = -6t^3 m/s^2. Its initial velocity at t = 0 is 5 m/s. How far will it move before stopping? ((((((The answer is " 7.5 m " ))))) Can you please show me the solution.

**machanics**

show that theoretically the period of rotation of a satelite which circles a planet of negligible distance firm its surface depends only on the density of the planet

**MATH**

In still water, a speed boat travels 5 times faster than the current of the river. If the speed boat can travel 48 miles upstream and 10 back in 5 hours, find the rate.

**Algebra**

go try your best not sure what the answer is

**Maths**

Ainsley’sandCaleb’sapartmentbuildingsareexactlythesameheight. Ainsley measures the distance between the buildings as 51 m and observes that the angle of depression from the roof of her building to the bottom of Caleb’s is about 64°. How tall, to the nearest ...

**Maths**

Ainsley’sandCaleb’sapartmentbuildingsareexactlythesameheight. Ainsley measures the distance between the buildings as 51 m and observes that the angle of depression from the roof of her building to the bottom of Caleb’s is about 64°. How tall, to the nearest ...

**Maths**

To use an extension ladder safely, the base must be 1 m out from the wall for every 2 m of vertical height. a) What is the maximum angle of elevation, to the nearest degree, to the top of the ladder? b) If the ladder is extended to 4.72 m in length, how high can it safely ...

**Structures**

Thank you so much!

**Structures**

A wood column is 5.5 in. square in cross section and 12 ft long. Its modulus of elasticity is 1.3 × 106 psi. How much will the column shorten under a compressive load of 36,000 lb?

**Chemistry**

You have to consider if it hydrogen-bonds with water. The stronger the H-bonding is, the higher the boiling point will be.

**Math**

Jeff and his friend each text four classmates about a concert. Each classmate then text four students from another school about the concert. If no one receives the message more than once, how many students from the other school receive a text about the concert.

**Computer Science**

i Need help, using loops, visual studio 2013. write a program using loops that will calculate the following, how much would $24 deposited in a bank in 1626, have been worth at the end of this year if it had received an interest rate of 6% compounded annually compounded ...

**math**

Thank you very much Damon :)

**math**

A cyclist travels for 60km at x km/h and 180km at y km/h and takes 10 hours altogether for the journey. If the speed are interchange, the journey takes 8.6 (8 whole number 2 over 3) hours. Find x and y.

**physics**

The AM frequencies of a radio dial range from 550 kHz, and the FM frequencies range of 88.0 MHz to MHz. all of these radio waves travel at a speed of 3.0x10^8 m/s, what are the wavelenght ranges of a.) the aM brand b.) FM brand

**Phsyics**

You place a 6.9 kg television set on a spring scale. The acceleration of gravity is 9.8 m/s2 . If the scale reads 75.43 N, what is the ac- celeration of gravity at that location? Answer in units of m/s2.

**Chemistry**

Calculate the grams of a product that is produced when there is 23 gms of each product Al2O3

**algebra**

The numerator of a fraction , equivalent to 3/4, is increased by an amount so that the value of the resulting fraction is 5/2. Find amount that the numerator is increased.

**college algebra help********

The answer that nia1598 has provided is wrong!!!!

**Pathways to Math Literacy**

Mike is putting up a snow fence on the west side of his property. He needs a post at each end to hold the fence up and would like to put a post in every 8 feet. If he uses 25 posts for his fence, how wide is the west side of his property?

**History**

Thank you!

**History**

Which answer best explains the contributions of women during the revolutionary war? Women only openly supported the British side during the Revolutionary War, as they feared for their lives while their husbands were away fighting Many women enlisted as soldiers, as was allowed...

**math**

Given BE = 11, EA = 11, BD = 7, and DC = 7, show that BED ~BAC

**P6 maths**

40% of Amy's stamps is equal to 75% of Mary's stamps. After Mary has given 25% of her stamps away , Amy has 90 more stamps than Mary. Find the total number of stamps they have at first

**physics**

The thermal energy stored in 1 kg of gasoline is about 10,000 kcal (42,000,000 J). A small car needs a forward force of about 500 N to move slowly at a constant speed on a leveled road (no change in ME). How far should the car go if all the energy stored in 1 kg gasoline is ...

**8th grade math**

I need help solving this problem. y=14-1/32x. Y is the number of gallons fuel in tank, x is the number of miles driven. tank contains 8.5 gallons of fuel. y=8.5 8.5=14-1/32x

**Math**

Mrs.Cress's table measures 5 ft wide and 8 ft long. She wants to cover the table with 3 in squares tiles. How many tiles will she need?

**Math**

The following are probabilities of selecting items from a bag. What is the probability of selecting other? Jolly rancher: 1/6 Gum: 2/7 Twizzlers: 1/3 other: ?

**Algebra**

(5)^-1/2 * (5x)^5/2 (5x)^-3/2 Simplifies to 1/5 * ã5x^5(1/ã5x^3) My final answer is x/ã5 is that correct?

**Maths**

At a flower shop , there was a total of 494 sunflowers and roses. After 2/5 of sunflowers and 57 roses were sold , the ratio of number of sunflowers to number of roses were 2:3. How many roses were there at first?

**niani**

l want you to help me.

**Alebra 2**

Give the applicable formula or law to use in each situation. If you are given two sides of a triangle and the included angle,how would you find the third side?

**Orgnic chemistry**

thanks.. but what does it mean to be induced?

**Orgnic chemistry**

Some molecules w/ non polar bonds like C-S and C-I when exposed to a highly polar environment may assume polarity -Due to vacant d orbitals of S (i don't get this. So if it has a lot of vacant orbitals it will be polar?) -big atomic radius of I (please explain this to me) ...

**algebra 2**

Write in exponential form. Log[base a]B=2

**english**

who

**Socials**

How did Stalin suppress his people's individuality and control their personal and economic lives? I am having trouble researching his methods of control and how his people's lives were affected. I know he initiated a great massacre to terminate anyone who disagreed ...

**History**

"malum" is 100 percent correct, thanks.

**MATH**

1 + 1,893 = 2,893

**algebra 2**

I'm having troubles understanding how to find the directrix,focus and roots of the parabola y=x^2-5x+4. If you could explain it to me so I understand for myself I'd appreciate it.

**math**

We throw 250 darts (one by one) at 1200 dart boards. Each dart strikes a board randomly. No dart's strike affects any other. What is the probability that two darts will strike the same board? I make it 1 in 1200, b/c the probability of the 1st dart striking a board is 1. ...

**math**

An amount of $27,000 is borrowed for 6 years at 8.25% interest, compounded annually. If the loan is paid in full at the end of that period, how much must be paid back?

**alg**

Indicate which type of comic each of the following represent.1) (x-3)^2/9+(y-2)^2/4=1 2. xy=3 5.(x+2)^2+(y-3)^2=49 6.x^2+4x=y-4

**History/ Civics**

1.How did the capture of Vicksburg, Mississippi, take advantage of a Confederate weakness? A-The Confederacy had few soldiers and relied on its well-trained generals to win battles. B- The Confederacy had few weapons manufacturers and relied on Vicksburg for ammunition. C- The...

**History**

1.Which 19th century movements were most associated with each another? A- Socialism and imperialism B- Transcendentalism and utopianism C- abolitionism and manifest destiny D- romanticism and democratic-republicanism 2.The writings of Transcendentalists had the greatest ...

**statistics**

Of the 6796 students in one school district, 1537 cannot read up to grade level. Among a sample of 812 of the students from this school district, 211 cannot read up to grade level. Find the sample proportion of students who cannot read up to grade level. A. 0.14 B. 0.26 C. 211...

**Chemistry**

What will be the potential of a cell constructed of a standard hydrogen electrode as one half-cell and a silver wire coated with AgBr dipping into 0.13 M HBr as the other half-cell? The value of Ksp for AgBr is 5.4 × 10-13. For the Ag/AgBr electrode, AgBr(s) + e- --->...

**math**

The amount of Jen’s monthly phone bill is normally distributed with a mean of $50 and a standard deviation of $10. Find the 25th percentile. A. About $46.30 B. About $43.30 C. About $43.40 D. about $43.20 I came up with $43.26 which its not a choice. Please help!!

**math**

The amount of Jen’s monthly phone bill is normally distributed with a mean of $50 and a standard deviation of $10. Find the 25th percentile. A. About $46.30 B. About $43.30 C. About $43.40 D. about $43.20 I came up with $43.26 which its not a choice. Please help!!

**math**

The batting averages of the first three batters in the Eureka College women’s softball team lineup are .310, .301, and .277. If the first three batters are considered as the “lead-off group”, what is the batting average of the group? A. .301 B. .296 C. There is ...

**Geometry**

Need help, not sure what I am suppose to do. Estimate the area between the graph of 4y = 16 - x^2 and the x-axis. The picture of a mound is on a piece of graph paper. Points A(-4,0) B(0,4)(4,0) Point B is the top of mound.

**science**

You would expect that an injection of an opiate drug into the __________ would activate dopamine neurons in the nucleus accumbens. A. ventral tegmental area B. medial septal region C. periaqueductal gray matter D. preoptic area My choice is C

**science**

A panic-prone person who ingests a(n) __________ would be expected to show increased anxiety. A. benzodiazepine agonist B. tricyclic antidepressant C. MAO inhibitor D. benzodiazepine antagonist is it A

**chemistry**

A 6.07 g sample of nutrients substances burned in a bomb calorimeter containing 2.00 x 10^2 g h2o.what is the fuel value (in nutrient Cal) per gram of sample if the temperature of the water increase 5.70c

**Chemistry**

At room temperature (25 °C), the gas ClNO is impure because it decomposes slightly according to the equation 2ClNO(g) Cl2(g) + 2NO(g) The extent of decomposition is about 4%. Based upon this, what is the approximate value of ΔG°298 for the reaction at that ...

**Chemistry**

Given these reactions and their corresponding ΔG° values, Glucose + phosphate → glucose-6-phosphate + H2O; ΔG° = +13.13 kJ ATP + H2O → ADP + phosphate; ΔG° = -32.22 kJ What is the calculated ΔG° for the coupled reaction Glucose...

**Art**

c b d is correct if you go to connexus. i got 100%

**Physics**

When a particular wire is vibrating with a frequency of 3.8 Hz, a transverse wave of wavelength 46 cm is produced. Determine the speed of wave pulses along the wire. Answer in units of m/s.

**Chemistry**

Consider the following equilibrium: At equilibrium, 4.0 × 10-2mol H2, 4.0 × 10-2mol CO, 1.0 × 10-2mol H2O and 1.0 × 10-2mol C were present in a 1.0L container. What is the value of Keq? a) 0.063 b) 16 c) 0.16 d) 6.3 I got b, but I'm not too certain ...

**chemistry**

AgCl(s) + 2NH3 ==> Cl^- + [Ag(NH3)2]^+ I 0........4.21M.......0 C -2x.......+x..........+x E -2x.......4.21-x......x 3.54x10^-3=(x)(4.21-x)/(-2x)^2 ??? Please help

**social studies**

Answers 100% B. D. B. A. A. I promise.

**Math**

1. At midnight, you are 60 feet due north of Jonas. You run due east at ten feet per second. Jonas walks two feet per second due north. How many seconds after midnight is Jonas closest to you? What is the corresponding minimum distance separating you and Jonas? 2. We need to ...

**Math**

Use Newton’s Method to approximate 3^(√7) to four decimal places. Use x1 = 2 as your seed. Round off intermediate iterates to five decimal place

**Math**

Use Newton’s Method to approximate 3^(√7) to four decimal places. Use x1 = 2 as your seed. Round off intermediate iterates to five decimal places

**Chemistry**

I don't understand what 62.36 mm hg is, and if you divide that amount by 293k (20 + 273), it doesn't come out to 1.85 mol.

**Chemistry**

I found this on the internet and I need an explanation. Q: You want to make sure a large weather balloon does not burst and wish to check the temperature at 3000 meters altitude. The balloon manufacture guarantees the balloon up to 60.0 Liters in size. Will the balloon make it...

**introduction to computing**

Write a C++ program that will accept the marks in a test for a group of 25 students then calculate and display the average mark and highest marks in class.

**Science**

I answered the questions, but I don't know if my choices are right. 1) Which of the following is an acidic pH? 6 7 8 800 None of the Above Answer: 6 ------------------------------------- 2) Which of the following is directly produced by photosynthesis? Glucose and oxygen ...

**Geometry**

The point G(5,-9) is rotated 90 degrees about point M(-8,3) and then reflected across the line y=9. Find the coordinates of the image G'. I have no idea where to start. Please advice.

**Science**

Actually nevermind, I found the answer: Half-life; 28.8 years. You can find the half-life of a substance by dividing the anount at one point in time by the amount remaining afterwards. Then multiply the elapsed time by the common log of 2 and by the amount of time that has ...