Final answer:
To find how fast the distance between two ships is changing, we calculate the distance they have covered, form a right triangle, and use the Pythagorean theorem and related rates to find that the distance is changing at approximately 8.94 km/h at 4:00 PM.
Explanation:
To determine how quickly the distance between ship A and ship B is changing, we can use the concept of related rates from calculus. At noon, the ships are 170 km apart. Ship A travels east (towards ship B) at 30 km/h, and ship B travels north at 25 km/h. By 4:00 PM, four hours have passed.
First, let's calculate the distance each ship has traveled after 4 hours. Ship A would have covered 30 km/h * 4h = 120 km eastward. Ship B would have traveled 25 km/h * 4h = 100 km northward.
Next, we need to calculate the distance between the two ships at 4:00 PM. Since ship A is moving east and ship B is moving north, they are traveling at right angles to each other. The distance between the two ships forms the hypotenuse of a right triangle, with the sides being the distances traveled by each ship. Using the Pythagorean theorem, the distance between the two ships at 4:00 PM (D) is:
² = (170 km - 120 km)² + (100 km)²
² = (50 km)² + (100 km)²
² = 2500 km² + 10000 km²
= √12500 km²
= 111.80 km (approx)
Finally, we have to find the rate at which this distance is changing. Let x be the east-west distance from ship B to ship A, and y be the northward distance ship B has covered. Taking the derivative of the Pythagorean relation we have, x² + y² = ², with respect to time (t) gives us:
2x(/) + 2y(/) = 2(/)
Given that dx/dt = -30 km/h (since it's decreasing as ship A sails east) and dy/dt = 25 km/h, we can solve for d/dt:
2*50*(-30) + 2*100*(25) = 2*111.80*(d/dt)
-3000 + 5000 = 223.60*(d/dt)
2000 = 223.60*(d/dt)
d/dt = 2000 / 223.60
d/dt = 8.94 km/h (approx)
Therefore, the distance between the ships is changing at approximately 8.94 km/h at 4:00 PM.
A building in a city has a rectangular base. The length of the base measures 70ft less than twice the width. The perimeter of the base is 910 ft. What are the dimensions of the base?
From a marginal analysis perspective, what is the inventory carry cost for Andrews if the company carries one additional unit of Able in inventory at the end? Select: 1Save Answer $9.98 $1.20 $1.92 $3.85
A brace for a shelf has the shape of a right triangle. Its hypotenuse is 10 inches long and the two legs are equal in length. How long are the legs of the triangle?
Find two positive integers such that the sum of the first number and four times the second number is 1000 and the product of the numbers is as large as possible
49 percent of all people who buy running shoes don't run at all. Assuming 340,000 people buy running shoes, how many will use them to run in?
A person randomly selects one of six envelopes. Each envelope contains a check that the person gets to keep. Determine the person's expectation if three envelopes contain a $533 check and three envelopes contain a $1039 check.
Answer with explanation:
Number of Envelopes possessed by the person = 6
Probability of selecting an Envelope is equal to [tex]/frac{1}{6}[/tex].
It is given that,three envelopes contains $ 533 check and another 3 Envelope contain $ 1039 check.We can consider that any of three checks contain $ 533 and another three $ 1089.
Expectation
[tex]E(x)=x_{1}p_{1}+x_{2}p_{2}+x_{3}p_{3}+x_{4}p_{4}+x_{5}p_{5}+x_{6}p_{6}\\\\\frac{1}{6} \times [533+533+533+1039+1039+1039]\\\\=\frac{1}{6} \times [4716]\\\\=786[\tex]
E(x)=786
how many different ways can you make 82 cents using current u.s. currency
a printer charges a fixed setup cost plus $0.40 for every 40 copies. if 320 copies cost $43.20 how much will it cost to print 1200 copies
The cost to print 1200 copies is $52.00.
The given data tells us that 320 copies cost $43.20. Each set of 40 copies costs $0.40, so 320 copies are 8 sets (320/40). The variable cost for 320 copies is 8 × $0.40 = $3.20.
We can then determine the fixed setup cost by subtracting the variable cost from the total cost for 320 copies: $43.20 - $3.20 = $40.00.
The total cost C for printing x copies can be expressed as:
C = fixed setup cost + variable cost per set × (x/40)
So the total cost for 1200 copies is:
C = $40.00 + $0.40 × (1200/40)
Calculating this, we get:
C = $40.00 + $0.40 × 30 = $40.00 + $12.00 = $52.00
Therefore, the cost to print 1200 copies is $52.00.
A cupcake recipe asks for 3/4 of a cup of butter. Rob wants to make 1/3 of the original recipe. How many cups of butter will Rob need?
Suppose a culture of bacteria starts with 8000 bacteria. After one hour, the count is 9000. Find an exponential equation that models the number of bacteria in hours. Keep at least 4 decimal places in your formula for rounded values. Find the doubling time of the bacteria. Round the doubling time to the nearest 0.01 hours.
The exponential equation that models the number of bacteria in hours is N = 8000 * (1 + 0.125)^t. The doubling time of the bacteria is 5.55 hours.
Explanation:To find an exponential equation that models the number of bacteria in hours, we can use the formula: N = N0 * (1 + r)^t.
Where:
N is the final count of bacteria (9000)N0 is the initial count of bacteria (8000)r is the growth rate (unknown)t is the time in hours (1)Plugging in the values, we have:
9000 = 8000 * (1 + r)^1
Dividing both sides by 8000, we get:
1.125 = 1 + r
Subtracting 1 from both sides, we find:
0.125 = r
Therefore, the exponential equation that models the number of bacteria in hours is: N = 8000 * (1 + 0.125)^t.
To find the doubling time of the bacteria, we can use the formula: t = log(2)/log(1 + r).
Plugging in the value of r (0.125), we have:
t = log(2)/log(1 + 0.125)
Using a calculator, we find that t is approximately 5.5452 hours. Rounded to the nearest 0.01 hours, the doubling time of the bacteria is 5.55 hours.
Find the exact solution using common logarithms 2^5x+3= 3^2x+1
A lock has a disk with 36 numbers written around its edge. The combination to the lock is made up of three numbers. What is the probability of correctly guess the combination?
The probability of correctly guessing the combination will be 1/7140.
What are permutation and combination?A permutation is an act of arranging items or elements in the correct order. Combinations are a way of selecting items or pieces from a group of objects or sets when the order of the components is immaterial.
A lock has a disk with 36 numbers written around its edge. The combination of the lock is made up of three numbers.
The total number of the events will be
Total event = ³⁶C₃
Total event = 36! / [(36 - 3)! x 3!]
Total event = 7140
The favorable number of the event will be one.
Then the probability of correctly guessing the combination will be
P = 1 / 7140
The probability of correctly guessing the combination will be 1/7140.
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Find the value of I given that p=300,r=0.14,andt=2
The sum of the length of l and 15
A 200 centimeter-long wire is cut into three pieces. The second piece is 3 times as long as the first. The third piece is 2 times as long as the second. How long is each piece?
The lengths of the three wire pieces are 20 cm for the first piece, 60 cm for the second piece, and 120 cm for the third piece.
Explanation:A wire that is 200 cm long is cut into three pieces.
We are told that the second piece is 3 times as long as the first piece and the third piece is 2 times as long as the second piece.
Let's denote the first piece's length as x centimeters.
According to the problem, the second piece will then be 3x centimeters long, and the third piece will be 2 * 3x = 6x centimeters long.
To find the length of each piece, we need to set up the following equation based on the total length of the wire:
x + 3x + 6x = 200
Combining terms, we have:
10x = 200
Dividing both sides by 10, we find:
x = 20
Therefore, the first piece is 20 cm long, the second piece is 3 * 20 cm = 60 cm long, and the third piece is 6 * 20 cm = 120 cm long.
insted of telling carmen her age ,sora gave this clue:my age is one-tenth of one-tenth of one-tenth of 3,000.
Write a number from 20 to 50 that has both tens and ones
Answer:
45
Step-by-step explanation:
We know that,
If we have the numbers of the form xyz.
This gives that, x is placed at the hundredth place, y is placed at the tens place and z is located at ones place.
Since, we need a number between 20 and 50 having both tens and ones place.
We can take any number from 20 to 50.
For e.g. Let us take 45.
In 45, 4 is placed at the tens place and 5 is placed at the ones place.
Hence, 45 is the number between 20 to 50 having both tens and ones place.
How to change 2/3 to eighteenths
The eighteenths of 2/3 is 12/18.
What is multiplication?In mathematics, multiplication is a method of finding the product of two or more numbers. It is one of the basic arithmetic operations, that we use in everyday life.
here, we have,
let,
2/3 = n/18
What is the GCF of 3 and 18
3: 1,3
18: 1,2,3,6,9,18
GCF-3
Therefore, 2/3 = 12/18
because 3 × 6= 18
what you do to the denominator you have to do the numerator
so 2 × 6= 12.
hence, eighteenths of 2/3 is 12/18.
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In our solar system, 666 of the 888 planets have moons. What percentage of the planets have moons?
Answer:
75% of the planets have moons
Step-by-step explanation:
In order to calculate this you just have to do a simple rule of three, in which you will use 888 as the 100 percent and you want to discover what percentage of that does 666 represents:
[tex]\frac{888}{100} \frac{666}{x} \\x=\frac{666*100}{888}\\ x=75\\[/tex]
So you have that 666 is the 75% of 888, that means that 75% of the planets have moons.
dora reaches her goal of $ 400 in savings.she decide to set a new goal of $900.how many $100 bills will she need to reach $900 in savings? explain your answer using words pictures or numbers
whats between 0 and [tex] \pi /2[/tex]
If the equilibrium interest rate in the money market is 5%, then at an interest rate of 2% sellers of interest-bearing financial assets _____ interest rates to find willing buyers.
Final answer:
At an interest rate of 2%, below the equilibrium rate of 5%, sellers of interest-bearing financial assets would need to raise interest rates to find willing buyers and reach the equilibrium.
Explanation:
If the equilibrium interest rate in the money market is 5%, then at an interest rate of 2%, sellers of interest-bearing financial assets would need to raise interest rates to find willing buyers. This situation outlines how the market responds when the interest rate is below the equilibrium level. If the interest rate is below equilibrium, there is an excess demand for financial capital; too many borrowers and not enough lenders at this low rate. To attract more lenders (sellers of financial assets), the interest rate would need to be increased. Conversely, when the interest rate is above the equilibrium, there is an excess supply, meaning there are more suppliers of loans than there are borrowers. Sellers in this scenario lower interest rates to attract more borrowers, bringing the market back to equilibrium.
This concept is parallel to the example where, at an interest rate of 21%, the supplied funds increase greatly while the demand falls sharply, leading to excess supply. Suppliers of financial capital, such as credit card companies, will then reduce their rates to encourage more borrowing, pushing the interest rate back toward the equilibrium. In the case of a government borrowing increase, if it leads to a higher demand for financial capital, this would cause the demand curve to shift to the right and result in a higher interest rate, potentially crowding out private investment.
Write the given expression in terms of x and y only.
sin(sin−1(x) + cos−1(y))
Certain gases in the atmosphere trap heat on Earth.
What is the name of this phenomenon?
A.
the greenhouse effect
B.
global warming
C.
glacial melting
D.
cooling period
this is science not mathematics
Answer:
the answer is a
Step-by-step explanation:
two angles are supplementary. their difference is 22°. find the angles
the kilo-prefix in the metric system means __________________ units
You 495 miles from home and you are driving toward home at an average of 45mph. How long will it take to drive home if you maintain the same speed? (Hint: When you reach home, the x-value is zero.)
Answer:
f(x)=45x
Step-by-step explanation:
if the home is 495 miles away, 11 hours would take to drive home.
f(11)=45X11=495
Crafty grandma Edith set her family down during Thanksgiving and told them they couldn't have any pet can pass until they worked out this puzzle are six-year-old granddaughter was the first to solve it can you work out what 9183 equals
8809=6 3590=2
7111=0 6855=3
9881=5 1012=1
6660=4 5731=0
5531=0 9191=2
2516=1 9193=?
A department store holds a year-end clearance sale that includes a 14.5% discount on cosmetics. Find the sales price of the bottle of perfume if it's original price was 56.69
56.69 - 0.145(56.69)
= 56.69 - 8.22
= 48.47
How to calculate discount and sale price?Find the original price (for example $90 )Get the discount percentage (for example 20% )Calculate the savings: 20% of $90 = $18.Subtract the savings from the original price to get the sale price: $90 - $18 = $72.the formula for discount price
Subtract the final price from the original price. Divide this number by the original price. Finally, multiply the result by 100. You've obtained a discount in percentages.
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Suppose that the mean GRE score for the USA is 500 and the standard deviation is 75. Use the Empirical Rule (also called the 68-95-99.7 Rule) to determine the percentage of students likely to get a score between 350 and 650? What percentage of students will get a score above 500?
Using the Empirical Rule, it is determined that 95% of students are likely to get a GRE score between 350 and 650, and 50% of students will get a score above 500.
According to the Empirical Rule (also known as the 68-95-99.7 Rule), about 95% of the values in a data set with a normal distribution will fall within two standard deviations of the mean. In this case, the mean GRE score is 500 and the standard deviation is 75. Using this rule, we can determine that 95% of the students would likely score between 500 - (2 imes 75) and 500 + (2 imes 75), equating to scores between 350 and 650.
Regarding the percentage of students that will get a score above 500, the distribution is symmetric around the mean in a normal distribution. Since the mean is 500, 50% of the values will lie above the mean and 50% will lie below. Therefore, 50% of students are expected to score above 500.