# Questions Asked onJune 16, 2020

1. ## Mathematics

From points A and B on level ground, the angles of elevation of the top of a building are 25° and 37° respectively. If |AB| = 57 m, calculate, to the nearest metre, the distances of the top of the building from A and B if they are both on the same side

2. ## Physics

A uniform half metre rule is freely pivoted at the 15cm Mark and it balanced horizontally when a body of mass 40g is hung from the 2cm Mark. calculate the mass of the rule

3. ## Algebra

48 is the sum of 20 and Jenny score use the variable j to represent Jenny score translate the sentence into an equation

4. ## World History

How did the Renaissance contribute to the Age of Discovery? Select all that apply. A.It eliminated Christianity from society and made Europeans more open-minded. B.It contributed to technological advancements that helped in navigation. C.It inspired a

5. ## Science

1) Study the scenario. System 1 has a large number of particles, moving slowly on average. System 2 has a smaller number of particles, but they are moving faster on average. Which system has a higher temperature? System 2 has a higher temperature because

6. ## Science

Scoop ice cream into 8 - 1/2 cup sized balls. Place on baking sheet and freeze until firm, about 1 hour. 3 egg whites 1)What is the radius of each ball? You can either approximate based on the volume measurement of each ice cream ball in the recipe 118

7. ## World History

What was King Henry VIII’s outward motivation for breaking away from the Roman Catholic Church and instituting the Church of England? a,King Henry VIII disapproved of the outcomes of the Council of Trent and decided to form the Church of England. b.King

8. ## maths

how do we solve Mary wants to make cookies.she needs 3/4 of a cup of flour per batch of cookies,if Mary has 6 cups of flour,then how many batch of cookies can she make?

9. ## Science

Calculating diffusion coefficient You want to make meatballs according to a recipe that says to marinate the meatballs in garlic and soy sauce before baking them in the oven. You prepare the marinade and immerse the meatballs, which are 6 cm in diameter,

10. ## Mathematics

Express each ratio as a fraction in its lowest terms 18hours to 2days

11. ## World History

Why did Europeans seek a direct route to trade with Asia? A.They wanted to bypass their Muslim rivals in the Middle East. B.They wanted to purchase tea and spices when they were freshest. C.Chinese merchants would only trade directly with Europeans.

12. ## Geometry

For the acute angles in a right triangle, sin (4x)° = cos (3x + 13) °. What is the number of degrees in the measure of the smaller angle

13. ## mathematics

If x-3 is directly proportional to the square of y and x=5 when y=2 ,find x when y=6

14. ## geography

Map Reduction and Enlargement 1). If the Scale of the original map is 1:50,000 and ask to draw a new map of 1:150,000. By how many times are you going to enlarge or reduce the map? 2). If the map extract has a scale of 1:100,000,how many times are you

15. ## Chemistry

calculate the pH of 0.025 mol dm^3 trioxonitrate (v) solution

16. ## Physics

An athlete swims the length if 50m pool in 20s and makes the return trip to starting point in 22s.Determine the average speed and velocities a. the first half of the trip b.second half of the trip c. Round trip

17. ## Science

What is the value of potential energy of a mango on a tree before it fells?

18. ## mathematics

A train is going at 1/3 of its usual speed and it takes an extra 30 minutes to reach its destination. Find its usual time to cover the same distance.

19. ## World History

How did the establishment of the Church of England change government? A.The Church of England did not collect taxes like the Roman Catholic Church. B.The Church of England ruled over court cases, unlike the Catholic Church of England. C.The head of state

20. ## Chem

Which of the following is not an example of a neutralization reaction? A HCl + NaOH NaCl +H2O B 2 NaOH + H2CO3 Na2CO3 +2 H2O C H2SO4 + 2 NH4OH (NH4)2SO4 + 2 H2O D 2 AgNO3 + Zn 2Ag +Zn(NO3)2 A?

21. ## Calculus

Write the symmetric equations of the line passing through A(3, 2, -1) and B(2, -1, -2)

22. ## mathematics

If x-3 is directly proportional to the square of y and x=5 when y=2,find x when y=6.

23. ## Chem

According to the Arrhenius Theory of acids and bases, a base is: A A substance that decrease the amount of hydroxide ions present. B A substance that increases the amount of hydroxide ions present when it is dissolved in water. C A substance that increase

24. ## Chem

Which of the following are true regarding acid-base titrations? A They are used to determine the concentration of an unknown acid or base. B The acid or the base must be a standard solution with a known concentration C The standard solution is titrated

25. ## math

(2, 3),(0, 5),(1, -2),(-6, 0),(0, -5),(0, 0), (-1, -1), (-4, 3),(4, 0),(-5, -6). Which points have y-cordinate+2?

26. ## Calculus

Find the area of the triangle whose vertices are A(1,0,1), B(2,-1,3), C(5,2,2).

27. ## world history

. Which phenomenon did triangular trade most directly encourage?

28. ## Calculus

Find a vector perpendicular ( = normal) to the line 2y = 5-3x in the xy-plane.

29. ## Calculus

Find the distance from the point P(5,10) to the line 2y = 5-3x in the xy-plane.

30. ## science

A boy of mass 10 kg runs up a set of step of total height 3 meters what is the work done against gravity

31. ## English

You wake up suddenly and heard someone shouting for "Help Help"describe what you see.

32. ## Math

Given that x= 3a+ 5/a+2. For what value of a is x not defined??

33. ## Mathematics

Find the midpoint of the line segment with end coordinates of: (1,7) and (3,−2) Give coordinates as decimals where appropriate.

34. ## Chemistry

1◇- You are asked to prepare 1.10-3 M 15 mL Potassium tri oxalato chromate (III) solution for conductivity measurement studies. Describe the preparation of the solution by making the necessary calculations? 2◇- Calculate the splitting energy of [Co

35. ## mathematics

X and Y are two stations which are 320 miles apart. A train starts at a certain time from X and travels towards Y at 70 mph. After 2 hours, another train starts from Y and travels towards X at 20 mph. At what time do they meet?

36. ## Mathematics

Find the midpoint of the line segment with end coordinates of: (−3,−1) and (−4,2) Give coordinates as decimals where appropriate.

37. ## algebra

a. 5(z + 1) = 3(z + 2) + 11 Solve for Z b. 7(x+4)-2[x-3(5+x)]=2/3(x-6)

38. ## chemistry

What is the molecular weight of estradiol if 0.2255 mol of sample weighs 61.42 g?

39. ## Mathematics

what is the probability of picking friday at random?

40. ## Calculus

Find the volume of the box with the vectors A = 2i + j + k , B = 3i - 4j+ 2k , C = i - j+ 2k as edges.

41. ## mathematics

Alecia deposited \$500 in a savings account at 5% compounded semiannually. What is her balance after 6 years? Please solve this question with steps.

42. ## chemistry

1◇- You are asked to prepare 1.10-3 M 15 mL Potassium tri oxalato chromate (III) solution for conductivity measurement studies. Describe the preparation of the solution by making the necessary calculations? 2◇- Calculate the splitting energy of [Co

43. ## Math

Find the derivative of each of the following functions using the product rule. you do not have to simplify your answer. A) f(y) = (1/y^2 - 3/y^4)(y+5y^3) B) H(u) = (u - √u)(2u^2+1)

44. ## Calculus

Determine the Scalar equation of the plane that passes through the point (2, -4, -3), and contains the vectors a = [-3, 5, -1] and b = [2, -4, 6]

45. ## Calculus

I know this is a repost and i tried to do this but i don't know how to do it. Find the derivative of each of the following functions using the product rule. you do not have to simplify your answer. A) f(y) = (1/y^2 - 3/y^4)(y+5y^3)

46. ## Calculus

3i-2j+k can be written as linear combination of which of the following vectors? a){(2,0,0,) (0,1,0,) ( 1,0,1)} b){(3,0,0) (-2,0,0) (1,0,0)} C){(3,2,1) (6,4,2) (-3,-2,-1)} d) {(1,0,0) (0,1,0) (2,0,0)} I got c) but I'm not sure if that's right bc idk if I

47. ## chemistry

what are the products of bacl2.2h2o + kcl???

48. ## mathematics

The thickness of a book varies directly with thee number of pages in the book.A book is 1.8 cm thick and contains 350 pages .What is the thickness of the first 84 pages of the book?

49. ## physics

1. Sin δ = ( cos δ + 200 )

50. ## geography

Calculate the gradient of a hill having a rise or vertical interval is 300 m while the run or horizontal equivalent is 7 cm. Note: The scale is the map is 1:200,000.

51. ## physics

A car is moving at a constant speed of 20 ms-1. The force retarding its motion is 500 N. Calculate the engine power of the car required to maintain the motion.

52. ## mathematics

I start with any 2 consecutive integers. I square each of them, then I add the 2 squares together. Construct an algebraic expression showing this

53. ## physics

The coordinates of an object moving in the xy plane vary with time according to the equations x = -6.85 sin ωt and y = 4.00 - 6.85 cos ωt, where ω is a constant, x and y are in meters, and t is in seconds. a. Determine the components of the velocity of

54. ## Math

A petrol station finds that its daily sales, in litres, are normally distributed with mean 4520 and standard deviation 560. (a) Find on how many days of the year (365 days) the daily sales can be expected to exceed 3900 litres.

55. ## physics

during a collision with a wall lasting from t=0 to t=2s,the force acting on a 2-kg object is given

56. ## mathematics

If a person walks at 4 mph, he covers a certain distance. If he walks at 9 mph, he covers 7.5 miles more. How much distance did he actually cover?

57. ## algebra

4y(x - 2)/45y = 6/3x( 3y+4x ) find x and y.

58. ## math

in a Cartesian graph, suppose you are given the coordinates of a point. you do not want to plot the point. How can you tell which quadrant the point will be in?

59. ## Math

Jazzmine kept a log of the movement of a troop of ants marching on an a anthill, as represented by the graph below. During which interval was the marching speed of the ants the greatest? During which intervals were the average rate of change the same?

60. ## Mathematics

3 count AB and C are such that the distance between A and B is 50km and the distance between A and C is 90km. if the bearing of B from A is 075 degree and the bearing of C from A is 310 degress. find the a distance B and C find the distance between B and C

61. ## Chem

Hello, I had a question regarding the percent error formula. When I google the formula different formulas pop up either being [Experimental-Theoretical] / Theoretical * 100 or [Theoretical-Experimental] / Theoretical * 100. Which one is correct?

62. ## Math

Lin’s father is paying for a \$20 meal. He has a 15%-off coupon for the meal. After the discount, a 7% sales tax is applied. What does Lin’s father pay for the meal? Explain or show your reasoning.