# Melissa

Popular questions and responses by Melissa
1. ## math

determine the value of k such that g(x)=3x+k intersects the quadratic function f(x)=2x^2-5x+3 at exactly one point determine the value(s) of k such that the linear function g(x)=4x+k does not intersect the parabola f(x)=-3x^2-x+4

2. ## physics

A particular guitar string is supposed to vibrate at 210Hz , but it is measured to vibrate at 220Hz By what percent should the tension in the string be changed to correct the frequency?

3. ## CHEMISTRY

Write formulas for the compounds that form from In and each of the following polyatomic ion: NO−3, SO2−4, PO3−4. (Assume In charge is 3+.) InNo9, InSO6, AND InP4 is wrong

4. ## physics

A 160kg horizontal beam is supported at each end. A 330kg piano rests a quarter of the way from one end. What is the vertical force on each of the supports?

5. ## Math

Find the area under the standard normal curve to the right of z = -1.25.

6. ## forces

Two teams of nine members each engage in a tug of war. The first team's members have average masses of 64 kg and exert average forces of 1350 N horizontally. The second team's members have average masses of 69 kg and exert average forces of 1365 N

7. ## Calculus - Rates of Change

A water tank has a shape of an inverted cone with a base radius of 2m and a height of 4 m. If water is being pumped into the tank at a rate of 2m3/min, then find the rate at which the water level is rising when the water is 3m deep. Attempted solution: V=

8. ## calculus

Make a substitution to express the integrand as a rational function and then evaluate the integral. (Use C for the constant of integration.) 1/x{(x-1)^1/2} dx

9. ## physics

The distance between the second and sixth crests in a wave is 75cm and one crest travels a distance of 25 cm in 3.0s . Find the frequency of the wave

10. ## physics

A 50.0kg cyclist on a 10.0kg bicycle speeds up from 5.0m/s to 10.0m/s , the total kinetic energy before acceleratingis 750, and after acceleratingis 3000, how much work is done to increase the kinetic energy of the cyclist and the bicycle

11. ## Math( help please ! )

The profit p(x) of a cosmetics company , in thousands of dollars,is given by p(x)=-5x^2+400x-2550, where x is the amount spent on advertising , in thousands of dollars a) determine the max profit the company can make b)Determine the amount spent on

12. ## Chemistry

You are a work study student in our chemistry department. Amy, your supervisor has just asked you to prepare 250ml of 2.00M H2SO4 solution for tomorrow's undergraduate experiment. The Stock Solutions cabinet is under the Stockroom Explorer. You will find

13. ## math

a ball is dropped from a height of 3m and bounces on the ground . At the top of each bounce, the ball eaches 60% of its previous height. Calculate the total distance travelled by the ball when it hits the ground for the fifth time

14. ## Chemistry

What mass, in grams, of sodium carbonate is required for complete reaction with 8.35g of nitric acid to produce sodium nitrate, carbon dioxide, and water? [Show work]

15. ## physics

An archer locks a 0.20kg arrow on a bowstring. Then the archer exerts an average force of 110N to draw the string back 0.60 m . Assume that friction is negligible . What speed does the bow give to the arrow? If the arrow is shot vertically upward,how high

16. ## physics

A child throws a ball with an initial speed of 8 m/s at an angle of 40 degrees above the horizontal. The ball leaves her hand 1 m above the ground. How long is the ball in flight before it hits the ground? What is the magnitude of the ball's velocity just

17. ## math

A farmer has 90 meters of fencing and would like to use the fencing to create a rectangular garden where one of the sides of the garden is against the side of a barn. Let L represent the varying length of the rectangular garden (in meters) and let A

18. ## Math

4 letters are typed, with repetition allowed. What is the probability that all 4 will be vowels? Write your answer as a percent. Round to the nearest hundredth of a percent as needed.

19. ## chemo

How much heat (in kJ) does it take to melt 28.4 grams of ice at 0 °C and raise the temperature of the resulting water to 25 °C? Heat of fusion 334 J/g, Specific heat 4.184 J/g °C ?

20. ## probabilty

In a school, 14% of students take drama and computer classes, and 67% take drama Class. What is the probabilty that a students takes computer class given that the student takes drama class? i have no idea how to work this so please show me your work.

21. ## Math !!!!!

a function f(x)has doamin {xeR/x>-4} and range {yeR/y

22. ## CHEMISTRY

Write formulas for the compounds that form from Sr and each of the following polyatomic ion: NO−3, SO2−4, PO3−4. APPARENTLY SrNO6, SrSO4 , Sr3PO8 is wrong

23. ## physics

A 12 kg toboggan is pulled along at a constant velocity on a horizontal surface by a horizontal force of 11 N How much horizontal force is needed to pull the toboggan at a constant velocity if two 57 kg girls are sitting in it ?

24. ## Physics!! Help!!!!!

A wire of length L and cross-sectional area A has resistance R. What will be the resistance R_stretched of the wire if it is stretched to twice its original length? Assume that the density and resistivity of the material do not change when the wire is

25. ## Math

4 letters are typed, without repetition. What is the probability that all 4 will be vowels? Write your answer as a percent. Round your answer to three decimal places.

26. ## CHEMISTRY

Provide the name of the oxyanion of the acid HNO2(aq) I ENTERED Carbonate ion BUT ITS WRONG

27. ## geography

what are the results/effects of poor service delivery socially,environmental and economic problems?

28. ## american government

judicial review is the power of the american courts to:

29. ## physics

The third resonant length of a closed air column is 75cm . What is the first and second length

30. ## Chemistry

Write the chemical formulas for the compounds containing each of the following: a) one calcium atom for every two iodide atoms. b) two nitrogen atoms for every four oxygen atoms. c) one silicon atom for every two oxygen atoms. d) one zinc atom for every

31. ## math

what do you call a duck that steals

32. ## CHEMISTRY

Write formulas for the compounds that form from Sr and each of the following polyatomic ion: NO3 −1, SO4 −2, PO4 −3. SR (+3 CHARGE) NO3(-1 CHARGE) SO4(-2 CHARGE) PO4(-3 CHARGE) Re posting this question. hopefully someone can help me answer this now.

33. ## Chemistry

Benzene, C6H6, reacts with nitric acid, HNO3. Two products are formed, one of which is water. The second product has a molar mass of 213 grams. The second product is composed of 33.8% carbon, 1.42% hydrogen, 19.7% nitrogen, and 45.1% oxygen. Write a

34. ## physics

What's the shortest air column , closed at one end, that will resonate at a frequency of 440.0Hz when the speed of sound is 352 m/s

35. ## Math

a teacher asked her students to think of a number, multiply by 5, and subtract the product from 20 , then she asked them to multiply the resulting difference by the number they first thougt of a) use function notation to express the final answer in terms

36. ## Chemistry- helpp!

The equation for synthesis of the poisonous gas COCl2 is CO(g) + Cl2(g)COCl2 If 43.2 kJ of energy is evolved when 39.5 g of COCl2 is synthesized, what is the molar enthalpy for this synthesis? THANK YOU!

37. ## Chemistry

I am doing a lab online and have no clue on how to get started with the following questions? Please Help me! 1. Calculate and record the following (in grams): (a) mass of NaCl by subtraction of other components: (b) measured mass of NaCl after boiling away

38. ## accoutning

what is an advantage of the partnership form of business organization is? 1. unlimited liability 2. mutual agency 3. ease of formation 4. limited life

39. ## skills ,concepts and atitude

Animal observation and investigations usually begin with A. handling the animal. B. a guiding question. C. feeding the animal. D. an outline of animal behavior. my answer is d.