Questions Asked on
June 17, 2017

  1. Chemistry

    A hydrate of copper (II) sulfate with formula CuSO4.xH2O has a molar mass of 250.0 g/mol. 2.545 g of hydrate is heated and 63.85% of the residue is found after heating. a) Determine the value of x in the formula of the compound b) What is the molecular

    asked by Kai
  2. maths

    An open rectangular box has internal dimensions 2m long, 20cm wide and 22.5cm deep. If the box is made of wood 2.5cm thick, calculate the volume of the wood in cm cube.

    asked by Aghedo sarah
  3. trigonometry

    the angle of elevation of the top of the tower from the foot of a flagpole is twice the angle of elevation of the top of the flagpole from the foot of the tower. at the point midway between the tower and the flagpole, the angles of elevation to their tops

    asked by jack
  4. trigonometry

    a triangle has sides equal to 68 cm, 77 cm and 75 cm, respectively. find the area of the escribed circle tangent to the shortest side of the triangle.

    asked by jack
  5. mathhelop

    A hot-dog stand owner makes a profit of $100 when he sells 90 hot dogs a day. He has a loss of $30 when he sells 25 hot dogs a day. Write a linear equation that represents his profit? No idea what I am supposed to do.

    asked by alisha
  6. Clinical Calculations

    Suppose that the adult dosage for a given medication is 150 milligrams​ (mg) per day for every 9 kilograms​ (kg) of body weight. ​a) At this rate find the daily dose for a man who weighs 117 kg. ​b) If the man is to receive 500 mg of this

    asked by Hannah
  7. Physics

    When a butterfly lands 12 cm from a concave mirror, it's image is 18 cm behind the mirror. Find the focal length 1/f=(1/do)-(1/di) 1/f=(1/12)-(1/18) 1/f=0.0833-0.0555 1/f=0.0277 f=36 I'm pretty confident w/ my math but as I understood, it's do-di if it's

    asked by Kayla
  8. trigonometry

    if the vertex of an isosceles triangle is 80 degrees and the side opposite the vertex measures 12 cm, determine the perimeter of the triangle

    asked by jack
  9. Algebra

    How many solutions as a system of equations have? 2X= -10y + 6 & x+5y=3

    asked by Xavier
  10. Math

    Teach me the method for this question: if a car travels 180km on 18 litres of petrol, then on a full 40litre - tank it should travel.

    asked by Chris
  11. Chemistry

    A compound contains 'N' and 'O' atom. The ratio of mass percentage of 'N' and 'O' is 7:16. If the vapour density of compound is 46, then find the no of 'O' atoms present per molecule of the compound.

    asked by Ishu
  12. Health Care Statistics

    A census is defined as which of the following? A. A collection of data B. A survey conducted with a small group C. A bureau of research specialists D. A count of a particular population B. I did my studying and it sows survey but I am hesitant of the

    asked by Anonymous
  13. Math

    Bridget has a photo album with 6 photos per page. The album is full. The total number of photos in the album is either 186, 286, or 386. She pays $2.85 to preserve each page. How much does Bridget spend to preserve the entire album?

    asked by Lanee
  14. math

    Roubd off each numbers in thousands 527 039'#999 999' 4456501; 400498 '

    asked by imrana
  15. Physics

    Two speakers send out sound in phase at a frequency of 779 Hz. When you are the same distance from both speakers you hear a maximum sound. Moving around, you hear essentially no sound when you are 65 cm from one and 85 cm from the other, and again when you

    asked by Anonymous
  16. math 106

    In this question we will check if a discount is actually a discount. Say you are to borrow $100 for a year at a simple interest rate of 10%. Determine the discount D and the proceeds P for this loan. Next take another look at the situation. You take away P

    asked by james smith
  17. Math

    In this question we will check if a discount is actually a discount. Say you are to borrow $100 for a year at a simple interest rate of 10%. Determine the discount D and the proceeds P for this loan. Next take another look at the situation. You take away P

    asked by Lisa
  18. English

    Someone is knocking on/at the door. Inside, we say, 'Who is it?' Can't we use, 'Who are you?' Is it rude to say, 'Who are you? (Can we use both prepositions, on and at here? Are both have the same meaning? what about the next question?)

    asked by rfvv
  19. Math

    The sum of my tens and hundreds digit is my thousands digit. My hundreds digit is 1 less than my tens digit. My ones digit is greater than 7 and a multiple of 4. My tens digit is is 3 less than my ones digit. What is my number?

    asked by Pinafili
  20. math 106

    A lender offers a choice between two loans. For loan A the lender charges 12% a year compounded 12 times a year. For loan B the lender charges 12.5% a year and compounds it once a year. Is loan A or loan B a cheaper loan for the borrower. Please show

    asked by james smith
  21. Math

    A lender offers a choice between two loans. For loan A the lender charges 12% a year compounded 12 times a year. For loan B the lender charges 12.5% a year and compounds it once a year. Is loan A or loan B a cheaper loan for the borrower. What formula do

    asked by Mark Jackson
  22. English

    1. He should have thought more carefully. 2. He regrets that he didn't think more carefully. 3. I regret that he didn't think more carefully. ------------------------------- Does #1 mean #2 or #3?

    asked by rfvv
  23. English

    The pet dog found his master. He said to the master,"It' me." (In a catroon) 1. It's me. 2. This is me. 3. I'm me. 4. That's me. (Can the pet use only #1? What about the other expressions?) -------------------------------------- The master said, "Is that

    asked by rfvv
  24. maths

    An open rectangular box has external dimensionsv100m long

    asked by Aghedo sarah
  25. Physics

    Two instances during which the heating effects of electric current is not required pls

    asked by Anonymous
  26. Maths

    A sum of $3500 is invested at simple interest and amounts to $6020 after 3 years.calculate the total interest

    asked by Sizalobuhle
  27. trigonometry

    A ship started sailing 42.58 degrees west of south at the rate of 15 kph. after 2 hours, ship B started at the same port going 46.33 degrees west of north at the rate of 7 kph. after how many hours will the second ship be exactly north of ship A?

    asked by jack
  28. Math

    I am a three digit odd number the tens and hundreds digit are both even the digits have the sum of 11

    asked by Dog
  29. math 106

    An employee saves for her retirement by depositing $1000 a quarter. She deposits her money in an annuity which pays a return of 2% a year compounded quarterly. What will the value of the annuity be after ten years ?

    asked by james smith
  30. math 106

    An bank client deposits some of her savings in a savings account bearing 3% annually of simple interest. The client deposits $500 and waits for interest to accumulate. How long will the client have to wait for the amount of interest to reach $60 ? Please

    asked by james smith
  31. Research Methodology and Program Evaluation

    Can someone help me with the following questions? When the purpose statement denotes an attempt to identify phenomena, events, or exercises, he or she is using: a. clarifying methods b. quantitative methods c. ethnographic methods d. unreliable method I

    asked by Lencho
  32. 7TH GRADE MATH HELP!!!!!

    Hey I had to divide 7 by 20 and the answer is .35 but I need to solve it without a calculator and I dont know what I'm doing please help thanks you

    asked by Sam
  33. Chemistry

    A mineral that contains iron and sulfur has the cubic unit cell pictured below. What is the empirical formula for this mineral? •Fe atoms are the smaller spheres; one on each corner and one on each face of the unit cell •S atoms are the eight larger

    asked by Kara
  34. math

    An employee saves for her retirement by depositing $1000 a quarter. She deposits her money in an annuity which pays a return of 2% a year compounded quarterly. What will the value of the annuity be after ten years? This is my answer is this correct?

    asked by Erica
  35. Math

    Sondra wants to give away 940 pennies to her younger cousins. She wants to give the pennies to either 2,3,5,6,9, or 10 cousins. How many cousins can Sondra equally give the pennies to?

    asked by Liu
  36. Math

    I am a four digit number the tens digit is greater than the ones and hundreds digit the digits have a sum of 15

    asked by Dog
  37. Physics

    Two speakers send out sound in phase at a frequency of 779 Hz. When you are the same distance from both speakers you hear a maximum sound. Moving around, you hear essentially no sound when you are 65 cm from one and 85 cm from the other, and again when you

    asked by Murph
  38. PGD EDUCATION

    Discuss the peculiarities that inform differential pattern of educational advancement in pre and post colonial Nigeria

    asked by BRAVE
  39. Math

    It's 7 #s long Hint 1: The first number times the last number will always equal the last number (first*last=last) Hint 2: fourth number minus the last number equals the third number (fourth-last-third) Hint 3: first number - sixth number equals fourth

    asked by Grace Ha
  40. Calculus

    Find the limit x->pi/2^+ tan(x) I know the answer is -∞, but I don't understand why. When I simplify to sin(x)/cos(x), I get 1/0^+.

    asked by Mike