Question

Emma is on a 50 m high bridge and sees two boats anchored below. From her position, boat A has a bearing of 230° and boat B has a bearing of 120°. Emma estimates the angles of depression to be about 38° for boat A and 35° for boat B. How far apart are the boats to the nearest meter?

243

likes
1214 views

Answer to a math question Emma is on a 50 m high bridge and sees two boats anchored below. From her position, boat A has a bearing of 230° and boat B has a bearing of 120°. Emma estimates the angles of depression to be about 38° for boat A and 35° for boat B. How far apart are the boats to the nearest meter?

Expert avatar
Jayne
4.4
106 Answers
In this diagram, point A represents Emma's position on the bridge, point B represents boat A, and point C represents boat B. We know that the height of the bridge is 50 meters, and the angles of depression to boats A and B are 38° and 35°, respectively. We also know that the bearings of boats A and B are 230° and 120°, respectively. We can use the tangent function to find the distances from Emma to boats A and B. For boat A, we have: tan(38°) = 50 / d_A Solving for d_A, we get: d_A = 50 / tan(38°) = 64.1 meters Similarly, for boat B, we have: tan(35°) = 50 / d_B Solving for d_B, we get: d_B = 50 / tan(35°) = 71.4 meters Now that we know the distances from Emma to boats A and B, we can use the Law of Cosines to find the distance between the two boats. The Law of Cosines states that: c^2 = a^2 + b^2 - 2ab * cos(C) where c is the distance between the two points, a and b are the distances to the two points from a third point, and C is the angle between the lines connecting the third point to the two other points. In this case, we have: c = d_A + d_B a = 50 meters b = 50 meters C = 110° Substituting these values into the Law of Cosines, we get: (d_A + d_B)^2 = 50^2 + 50^2 - 2 * 50 * 50 * cos(110°) Solving for c, we get: c = sqrt((d_A + d_B)^2 - 50^2 - 50^2 + 2 * 50 * 50 * cos(110°)) Plugging in the values for d_A and d_B, we get: c = sqrt((64.1 + 71.4)^2 - 50^2 - 50^2 + 2 * 50 * 50 * cos(110°)) Evaluating this expression, we get: c = 111.4 meters Therefore, the distance between the two boats is approximately 111 meters to the nearest meter.

Frequently asked questions (FAQs)
What is the period of the trigonometric function f(x) = sin(5x) - cos(3x) - tan(2x) in radians?
+
Math question: What is the slope-intercept equation of the line that passes through the points (3,5) and (1,9)?
+
What is the derivative of f(g(x)) with respect to x, if f(x) and g(x) are differentiable functions?
+
New questions in Mathematics
Solution to the equation y'' - y' - 6y = 0
Solve: −3(−2x+23)+12=6(−4x+9)+9.
If O(3,-2) is reflected across x = 2. What are the coordinates of O
The length and breadth of my rectangular vegetable garden is 12,5m and 7,25m respectively. What is the perimeter of the garden?
Elliot opened a savings account and deposited $5000.00 as principal. The account earns 4% interest, compounded annually. How much interest will he earn after 5 years? Round your answer to the nearest cent.
In a store there are packets of chocolate, strawberry, tutti-frutti, lemon, grape and banana sweets. If a person needs to choose 4 flavors of candy from those available, how many ways can they make that choice?
Two events E and F are​ ________ if the occurrence of event E in a probability experiment does not affect the probability of event F.
Suppose 50% of the doctors and hospital are surgeons if a sample of 576 doctors is selected what is the probability that the sample proportion of surgeons will be greater than 55% round your answer to four decimal places
Divide 22 by 5 solve it by array and an area model
calculate the normal vector of line y = -0.75x + 3
If f(x,y)=6xy^2+3y^3 find (∫3,-2) f(x,y)dx.
Let A, B, C and D be sets such that | A| = |C| and |B| = |D|. Prove that |A × B| = |C × D|
The simple average of 15 , 30 , 40 , and 45 is
-1%2F2x-4%3D18
In a physics degree course, there is an average dropout of 17 students in the first semester. What is the probability that the number of dropouts in the first semester in a randomly selected year has between 13 and 16 students?
17. A loan for $104259 is taken out for 10 years with an annual interest rate of 9.4%, compounded quarterly. What quarterly payment is required to pay the loan off in 10 years? Enter to the nearest cent (two decimals). Do not use $ signs or commas in the answer.
A multiple choice exam is made up of 10 questions; Each question has 5 options and only one of them is correct. If a person answers at random, what is the probability of answering only 3 good questions?
Translate to an equation and solve. Let x be the unknown number: What number is 52% of 81.
A buyer purchased a North Carolina home for $475,250. The seller allowed the buyer to assume his first small mortgage with a loan balance of $110,000. How much is the excise tax paid in the transaction? $951 $729.50 $950.50 $221 none of the above
A person travels by car from one city to another with different constant speeds between pairs of cities. She drives for 55.0 min at 100.0 km/h, 14.0 min at 65.0 km/h, and 45.0 min at 60.0 km/h and spends 20.0 min eating lunch and buying gas. (a) Determine the average speed for the trip.