# Posts by Alex

Total # Posts: 3,766

Algebra 2
5.) A boat makes a trip downstream in 5 hours. The return trip against the current takes 12 hours. If the speed of the current is 3 1/2 km/h, what is the speed of the boat in still water? 6.) How far does the boat referred to in Exercise 5 travel (one-way)?

Algebra 2
Worldwide Airlines flies from Lakeside to Whichitfalls in 4 hours with a tail wind, The return trip against the wind takes 5 hours. Whichitfalls is 5040km from Lakeside. Find the speed of the plane and the velocity of the wind. Would you get on the plane?

English 12
Which character is described in these lines? (10 points) Lord of the Scyldings, this single petition? Not to refuse me, defender of warriors, Friend-lord of folks, so far have I sought thee, That I may unaided, my earlmen assisting me, This brave-mooded war-band, purify Heorot...

Physics
Larry leaves home at 9:03 and runs at constant speed to the lamppost(200 yards from the start). He reaches the lamppost at 9:07, immediately turns, and runs to the tree(1200 yards from the start). Larry arrives at the tree at 9:13. What is Larry’s average velocity, in ...

physics
Calculate the wavelength (in m) of a photon capable of exciting an electron in Li2+ from the state n= 3 to the state n=5 1.4239*10^-7 - correct

physics
ok.. thanks c:

physics
Precision refers to the closeness of two or more measurements to each other... Accuracy refers to the closeness of a measured value to a standard or known value.... So would it be precise and accurate?

physics
sorry. not precise and not very accurate not precise but very accurate precise and accurate precise but not very accurate (i think its this one)

physics
You measure the mass of a 500 g standard on your balance four times. You get values of 455 g, 456 g, 454 g, and 455 g. Which of the following best describes your balance?

Math
2 2/5

Chemistry
Calculate the maximun=m mass of ethanol that can be made from 5.6 tonnes of ethen

earth science
Which of the following is not an example of a mineral crystal shape? A. Pyrite B. Kryptonite C. Quartz D. Calcite i think its A am i right

Physics
A small charged sphere,A, carries 4 times the charge of another sphere B. When these are placed 4.5 cm apart, they experience a force of 0.016N attraction between them. Find the charge on B.

chemistry
How many milliliters of a 0.100 M NaOH solution are required to neutralize 25.0 milliliters of 0.150 M HCl? Select one: a. 25.0 ml b. 37.5 ml c. 125 ml d. 167 ml

physics
Fred and George who are identical twins (same body mass) are competing in aerial skiing. Fred hits the take off with a speed of 20 whereas George has a speed of 8.5. How much higher will Fred go?

Chemistry
What quantity of heat is required to convert 200g of ice at 0.00C into water at 50C? I know that im suppose to use the E=mc(Delta T) but im not sure how...

Algebra
The height of an object after it is released can be modeled by the function f(t)=-16t^2+vt+s, where t is the n? The height of an object after it is released can be modeled by the function f(t)=-16t^2+vt+s, where t is the number of seconds after the object is released, v is the...

algebra
Each person will have exactly the same amount over time because each invested \$10,000 at an average interest rate of 7%. Tasha’s investment will yield more over many years because the amount invested at 8% causes the overall total to increase faster. Thomas’s ...

algebra
Tasha invests \$5,000 annually at 6% and \$5,000 annually at 8%. Thomas invests \$10,000 annually at 7%. Which statement accurately compares the two investments if interest is compounded annually?

Algebra
thanks!!

Algebra
A toy rocket that is shot in the air with an upward velocity of 48 feet per second can be modeled by the function f(t)=-16t^2+48t , where t is the time in seconds since the rocket was shot and f(t) is the rocket’s height. What is the maximum height the rocket reaches? ...

chemistry
Yes I get it thanks Dr.

chemistry
Balance by oxidation method the SO2 + MnO4+H2O --MnSO4+H2SO4+SO4(-2)

Algebra
Evan washes two types of vehicles. It takes him 30 minutes to wash a car and 40 minutes to wash a truck. He charges \$12 to wash a car and \$15 to wash a truck. In 270 minutes, Evan made \$105 washing cars and trucks. How many trucks did Evan wash?

algebra
A chicken farm orders bags of feed from two farmers. Store X charges \$20 per bag, and store Y charges \$15 per bag. The farm must obtain at least 60 bags per week to care for the chickens properly. Store Y can provide a maximum of 40 bags per week, and the farm has committed to...

Algebra
A sports memorabilia store makes \$6 profit on each football it sells and \$5.50 profit on each baseball it sells. In a typical month, it sells between 35 and 45 footballs and between 40 and 55 baseballs. The store has no more than 80 footballs and baseballs in stock during the ...

Math
Dont know!!!

pre cal
what are the real and imaginary zeros of the equation 2x^3 + 5x^2 - 3x + 7

pre cal
f(x) = two divided by quantity x squared minus two x minus three Graph A coordinate axis scaled by one. Domain and Range : _____________________ x and y Intercept(s) : _____________________ Horizontal Asymptote(s) : ___________________ Vertical Asymptote(s) : ...

pre cal
Choose the point on the terminal side of -45°

math
Give an example of a rational function that has no horizontal asymptote and a vertical asymptote at x = 1.

algebra
There are 5 red marbles for every 25 blue ones. How many red marbles are there in a group of 600 marbles?

Highcschool
Which one of the characters you read about is 12 years old? A. The narrator’s daughter in “The Yellow Wallpaper” B. Ginger Nut in “Bartleby” C. Lily Dyer in “A New England Nun” D. The son of the old man in “The Tell-Tale Heart

Math
Action Video rents only action and horror films. Over one 7 day period, they rented 5 horror films for every 9 action films. If they rented 99 action films, what was the mean number of films they rented per day?

geometry

geometry
In a triangle, the measure of the first angle is four times the measure of the second angle. The measure of the third angle is 84 degrees more than the second angle. what is the measure of the first angle?

high school algrebra 1
Thank You!

high school algrebra 1
A youth group is planning a trip to a local amusement park. They are taking a van which holds 10 people. It will cost \$25 for parking and tickets to enter the park are \$18 per person. create an equation for this situation

History
When did the US pull out of the Vietnam War? Some sources say 1973 and then others say 1969..?

Chem
Complete and balance the reaction of A) (CH3)2NH(aq)+CH3COOH(aq)→ B) CH3CH2NH2(aq)+HBr(aq)→ C) CH3NH2(aq)+HCOOH(aq)→

Chemistry!!
Complete and balance the reaction of A) (CH3)2NH(aq)+CH3COOH(aq)→ B) CH3CH2NH2(aq)+HBr(aq)→ C) CH3NH2(aq)+HCOOH(aq)→

Physics
A rock is thrown directly upward from the edge of a flat roof of a building that is 56.3 meters tall. The rock misses the building on its way down, and is observed to strike the ground 4.00 seconds after being thrown. Take the acceleration due to gravity to have magnitude and ...

SCIENCE HELP !!
thx ur a life saver

I get conductor but not why you chose insolater. and a series circuit is if all the lights went out all of you are thinking of a parallel circuit

I get conductor but not why you chose insolater.

physics
What about how far it has traveled in the time

Algebra 2
find the exact value of cos 300 degrees.

Physical Science
Thank you both very much!

Physical Science
The specific heat of copper is 0.385 J/g.°C. Which equation would you use to calculate the amount of heat needed to raise the temperature of 0.75 g of copper from 7°C to 29°C? a. Q = 0.385 J/g.°C ` (29°C 7°C) b. Q = 0.75 g ` 0.385 J/g.°C ` 29°C ...

Java Programming
Oh and ull need to format it, i don't think it will be formatted from here.

Java Programming
JUST COPY PAST TO ECLIPSE (OR WHATEVER ELSE U USE) I KNOW THIS WAS POSTED LIKE A WEEK AFTER BUT I DID THIS MOSTLY TO PRACTICE, HOPE IT WAS USEFULL import java.util.Scanner; public class Array { public static void main(String[] args) { //JUST GETTING SOME INPUT FIRST System.out...

Chemistry

math
3 bags in 3 bags he will have 6 pounds. If for each bag he needs 5/6 of a pound this means he will have 1/6 x 6 leftover, which is exactly another bag.

Math

Math
Solve by elimination: 5x+7y=77 , 5x+3y=53 can you please help me out step by step so I can understand it on my own, thanks.

Probability
2) the correct answer is 41/17

Physical Science
Which of these cannot increase the strength of an electromagnet? a. making the loops smaller in the coil b. placing an iron bar in the coil c. winding more loops in the coil d. increasing the current in the coil

Chemistry
A reaction : A(aq)+B(aq) --> C(aq) has a standard free-energy change of –4.01 kJ/mol at 25 °C. What are the concentrations of A, B, and C at equilibrium if, at the beginning of the reaction, their concentrations are 0.30 M, 0.40 M, and 0 M, respectively? I used ...

chemistry
estimate the mass of BaSO4 that will be produced when a 100ml of a 2M solution of Ba(NO3)2 in water is added toa 100ml of a 2M solution of NaSO4 in water

physics
a certain hamornic motion has amplitude of 0.7m and a period of 1.3s.find(a)the frequency of oscillation(b)the maximum velocity(c)the maximum acceleration

Physics 1
A cart with mass 340 g moving on a frictionless linear air track at an initial speed of 1.5 m/s undergoes an elastic collision with an initially stationary cart of unknown mass. After the collision, the first cart continues in its original direction at 0.42 m/s. (a) What is ...

Econ
The process that produces Sonora Bars (a type of candy) is intended to produce bars with a mean weight of 55 gm. The process standard deviation is known to be 0.77 gm. A random sample of 49 candy bars yields a mean weight of 55.82 gm. Find the test statistic to see whether the...

Physics
A police car stopped at a set of lights has a speeder pass it at 100 km/h. If the police car can accelerate at 3.6 m/s2, a) how long does it take to catch the speeder? b) how far would the police car have to go before it catches the speeder? c) what would its speed be when it ...

Algebra 1
4 pencils and 5 pens cost \$2.00; 3 pencils and 4 pens cost \$1.58. Write out a system of equations that would represent this situation.

English
Ok

English
Which description would not apply to a typical metropolis ? A. Bustling B. Crowded C. Large d. Rustic I think it's is A

English
Ok I will do that now so I am thinking it A

English
A word closely associated with altercation is ? A. revision B. Adherent C. Sensible D. Argument I think it is letter B is that right ? Please answer me

English
Ok

English
I meant its A

English
An invincible team is one that has never know ? A. The joy of victory B. The agony of defeat C. The fear of flying D. Injury or illness I am thinking it could be letter D

english/vocabulary
Look back at "failing infrastructure" write a letter to your state representative describing an infrastructure problem in your community and urging swift action. thoroughly describe the problem and it's solution, explaining why it is vital to take action ...

english/vocabulary
ok thank you so much for you help i real appreciate it

english/vocabulary
can you please help me on word study with writing with idioms ? 1. sick as a dog 2. the best of both worlds 3. under the weather 4. nest eggs 5. when pigs fly 6. slip through the cracks 7. go to seed 8 . thorn in your side 9. turn over a new leaf 10. fifth wheel 11. pitch in ...

MATH
THANK YOU FOR HELP ME SO MUCH ON MY HOMEWORK I REAL appreciate it

math
you were right i thought so that's why i wrote to you .

math
how can you solve this problem ? here X=Y plz help me fast

physics
A thin, uniform rod is hinged at its midpoint. To begin with, one-half of the rod is bent upward and is perpendicular to the other half. This bent object is rotating at an angular velocity of 7.1 rad/s about an axis that is perpendicular to the left end of the rod and parallel...

Physical Science
13. Why can convex mirrors only produce virtual images? Sadly, I can't find this answer in my book. :( Any help would be appreciated, please and thank you!

Math help
A catapult launches a boulder with an upwark velocity pf 184 feet per second. the heigh of the boulder in feet after t seconds is given by the function h(t)=-16t^2+184t+20. how long does it take the boulder to reach its maximum height? What is the boulders maximum height? ...

Word problem
Mrs sue or Damon am I correct?

Word problem
. A catapult launches a boulder with an upwark velocity pf 184 feet per second. the heigh of the boulder in feet after t seconds is given by the function h(t)=-16t^2+184t+20. how long does it take the boulder to reach its maximum height? What is the boulders maximum height? ...

Equations
How many real number solutions does the equation have y=3x^2+18x+27 none one two infinite

Equation help 2 questions
Mrs sue can you help me with question 2?

Equation help 2 questions
is number 1 none?

Equation help 2 questions
How many real number solutions does the equation have y=-4x^2+7x-8 none one two infinite How many real number solutions does the equation have y=3x^2+18x+27 none one two infinite Thank you!

math
20ft

Equation help
can someone help?

Equation help
A physics student stands at the top of a hill that has an elevation of 56 meters. he throws a rock and it goes up into the air and then falls back past him and lands on the ground below. The path of the rock can be modeled by the equation y=0.04x^2+1.3x+56 where x is the ...

UCF
What will be the change in enthalpy when 100.0 g of butane, C4H10, is burned in oxygen as shown in the thermochemical equation below? 2 C4H10(l) + 13 O2(g) → 8 CO2(g) + 10 H2O(g) ΔH = −5271 kJ −2636 kJ −4534 kJ −9087 kJ −1.817 × ...

trig
a hot air balloon climbs continuously along a 30° angle to a height of 5,000 feet. To the nearest tenth of a foot, how far has the balloon traveled to reach 5,000 feet? Draw a sketch and then solve.

chemistry
A is the central atom and B is an atom bonded to the central atom. n is the number of B atoms.

chemistry
2 is linear. 3 is trigonal. 4 is tetrahedral. 5 is trigonal bipyramidal. And 6 is octahedral.

Geometry
I need help!!! a hemispherical bowl with radius 25cm contains water whose depth is 10cm. what is the water's surface area

US history
Would question 4 be B instead?

US history
True False The divorce rate in America declined in the 1920s. false right? All of the following were anti-modern reactions except A.fundamentalism B. Ku Klux Klan C. cultural anthropology D. arts and crafts movement E. prohibition F. None of the above Is it D? Fundamentalists ...

Math 110
I don't understand how you got 2016. I understand how you added to get the 1,9, 11, and 6. But I do not understand where you got the 1->2, 9->0, and 11->1.