Answer:
1) 150 mph
2) 90 mph
3) 3 mph
Explanation:
1) The trains move at a constant speed, and after 5 hours they are 750 miles apart. 750/5=150
2) The faster train is 1.5 faster than the slower train, and we know their combined speed is 150 mph. 150/5=30, and 30x3=90.
3) We know that both trains combined travel 150 mph. 450/150=3.
Based on the data given, the speeds and time taken are as follows:
The combined speed of the two trains is 150 mphThe speed of faster train 150 x 3/5 = 90 mphThe time taken by the trains to cover 450 miles = 3 hoursWhat is speed?Speed is the ratio of distance covered and time taken.
Speed = distance/time1)The distance covered by the two trains in 5 hours = 750 miles.
The trains move at a constant speed and their combined speed will be:
Combined speed = 750/5
Combined speed = 150 mph
2) The train heading south has a speed 1.5 times faster than the other train heading north.
Ratio of speeds = 3 : 2
Speed of faster train 150 x 3/5 = 90 mph
3) The combined speed of the trains = 150 mph
Distance to be covered = 450 miles
Time taken = 450/150
Time taken = 3 hours
In conclusion, the speed of the two trains are determined from the distance travelled and time taken.
Learn more about speed at: https://brainly.com/question/6504879
#SPJ1
PLEASE HELP EMERGENCY 50 POINTS
Estimate the length of wire to the nearest inch. Suppose that it is coiled 11 times. Which numbers did you use to estimate the length of wire in the question above? Explain your process of estimation.
***the white bar spanning the yellow wire says 11 inches inside the little box, for some reason it got lost when moving the picture
Instructions: Determine if AB is tangent to the circle.
AB
20
B
12
수 to the circle.
16
Step-by-step explanation:
to be a tangent, it would have to have a 90° angle with the radius (12).
and that would make the triangle ABCenter of the circle a right-angled triangle.
and then Pythagoras must apply :
c² = a² + b²
with c being the Hypotenuse (the baseline opposite of the 90° angle). in our case the 20-line.
so,
20² = 12² + 16²
400 = 144 + 256 = 400
yes, it is confirmed, because the Pythagoras principle applies, it is a right-angled triangle, and therefore AB is indeed a tangent.
Answer:
the line AB is tangent to the circle
Step-by-step explanation:
we have :
16² + 12² = 256 +144 = 400
On the other hand:
20² = 400
Then
16² + 12² = 20²
Then
According to the Pythagorean theorem:
The line AB is perpendicular to the radius of the circle
Which means the line AB is tangent to the circle.
A pet store has 11 puppies, including 4 poodles, 5 terriers, and 2 retrievers. If Rebecka and Aaron, in that order, each select one puppy at random with replacement (they may both select the same one), find the probability that Rebecka selects a terrier and Aaron selects a retriever.
The probability that Rebecka selects a terrier and Aaron selects a retriever is 10/121
How to determine the probability?The distribution of the puppies is given as:
4 poodles, 5 terriers, and 2 retrievers
The probability of selecting a terrier is;
P(terrier) = 5/11
The probability of selecting a retriever is;
P(retriever) = 2/11
The required probability is
P = 5/11 * 2/11
Evaluate
P = 10/121
Hence, the probability that Rebecka selects a terrier and Aaron selects a retriever is 10/121
Read more about probability at:
https://brainly.com/question/11234923
#SPJ1
What is the domain of the function y=2√x-6?
88AX<∞
O 0≤x<∞
3≤x<∞
6≤x<∞
Answer:
If the x-6 is all under the sqrt, the last answer is right:
6<= x <= infinity
If only x is under the sqrt and - 6 is NOT under the sqrt, then:
0 <= x <= infinity is the correct answer.
Step-by-step explanation:
You can look at the equation and or graph to determine the domain of a function. The domain is all the x's that may go into the equation or all the x's on the graph of the function. Inside of a squareroot symbol the number inside there must be positive. While considering the equation, only x's that keep that inside positive can be used.
For sqrt(x-6), x has to be 6 or bigger.
For sqrt(x) - 6, x has to be 0 or bigger.
A school year begins with 24 students
trying out for the basketball team and 20
students trying out for the debate team.
Within a week, 6 students have dropped
out of the basketball tryouts and 2
students have dropped out of the debate
tryouts. What percentage of the remaining
students are trying out for the basketball
team?
Answer:
50%
Step-by-step explanation:
In rhe beginning, there were 24 + 20 = 44 students trying out in total. After a week, there are 44 - 6 - 2 = 36 students remaining. Of those 36 students, 18 of them are trying out for the basketball team. The percentage of students trying out for the basketball team would be 18/36 = 0.5 = 50%
Which graph represents this inequality Y is greater than or less to 4X -3
The graph of the inequality can be seen in the image at the end.
Which graph represents the inequality?
Here we have the inequality:
y ≥ 4x - 3
To graph this we need to graph the line:
y = 4x - 3
With a solid line (because the points on the line are solutions) and then shade the region above that line.
The graph of the inequality can be seen below.
If you want to learn more about inequalities:
https://brainly.com/question/18881247
#SPJ1
if one adult is randomly chosen from the group, what is the probability that the adult does not use a cell phone app for shopping and is at least 40 years old?
Answer:
1/100
Step-by-step explanation:
The answer is 1/100 because we don't know how many people are in the group but do know that only 1 person has been taken from the group and the probability will be 1 out of how many people are in the group so we just put 100 there as we don't know how many people are in the group.
Ps: Sorry if this is wrong, this is just a guess.
Determine the measure of the interior angle at vertex C
A. 180
B. 54
C. 240
D. 144
The measure of the interior angle at vertex C is D. 144.
How to calculate the angle?Based on the information given, the angle will be calculated thus:
8x + 8x + 8x + 3x + 3x = (5 - 2) × 180
30x = 540
Divide both side by 30
30x/30 = 540/30
x = 18
Therefore, at vertex C, we have 8x. This will be:
= 8x
= 8 × 18
= 144
Learn more about angles on:
brainly.com/question/13007711
#SPJ1
(c) Mohammed's height is 169 cm and Fatima's height is 156 cm.
The frame sizes of their bikes are in the same ratio as their heights.
The frame size of Mohammed's bike is 52 cm.
Calculate the frame size of Fatima's bike.
Answer:
156 : 48
Step-by-step explanation:
Solution:
Since
169 : 52 = 156 : X
Then we know
52/169 = X/156
Multiplying both sides by 156 cancels on the right
156 × (52/169) = (X/156) × 156
156 × (52/169) = X
Then solving for X
X = 156 × (52/169)
X = 48
Therefore
169 : 52 = 156 : 48
Write an expression that is equivalent
1/2a-4
Step-by-step explanation:
Answer
a - 8
------------+
2
find the values of x for the following equations..[tex]x^{2} +4x-98=0[/tex]
Hello !
Look at the picture
A and B have coordinates –2 and 10 on a number line. If it is marked off into 6 congruent segments, which one of the following coordinates is NOT one of the marked points? a. 0 c. 3 b. 2 d. 8
Using proportions, it is found that the coordinate that is not marked is given by:
c. 3
What is a proportion?A proportion is a fraction of a total amount, and the measures are related using a rule of three.
There are 6 congruent segments between -2 and 10, hence the length of each segment is given by:
l = (10 - (-2))/6 = 2.
Then the points are: -2, 0, 2, 4, 6, 8, 10. 3 is not marked, hence option c is correct.
More can be learned about proportions at https://brainly.com/question/24372153
#SPJ1
Answer two questions about Systems A and B:
−3x−2y=4
5x−8y=−1
5x−8y=−1
−3x−2y=4
1) How can we get System B from System A?
Choose 1 answer:
Swap the order of the equations
(Choice A, Checked, Correct)
CORRECT (SELECTED)
Yes
For the given systems we have:
1) Just swap the equations in system A.
2) Yes, the systems are equivalent.
How can we get System B from System A?Here we have the systems:
A:
-3x - 2y = 4
5x - 8y = -1
B:
5x - y = -1
-3x - 2y = 4
Notice that we have the same equations, just in a different order. So if we swap the first and second equations in system A, we get system B.
Are the systems equivalent?
Yes, because both systems are defined by the same equations.
If you want to learn more about systems of equations:
https://brainly.com/question/14323743
#SPJ1
twenty six thousandths in numerical form
Answer:
0.026
Step-by-step explanation:
Twenty-Six = 26 ( But for simplicity in the Next Step write it as 26.)
Tenths means to move the Decimal Point 1 Place LeftHundredths means to move the Decimal Point 2 Place LeftThousandths means to move the Decimal Point 3 Place LeftThen Twenty-Six Thousandths = 0.026
Which expression is equivalent to 1/2 (2 - 5x + 6)?
0 -5/4x+2
O -5 +6 1/2
O - 5/4x+1
O-5x+8
Below, the two-way table is given for a class
of students.
Freshmen
Sophomore
Juniors
Seniors
Total
Male
4
Female
3
6
3
Total
If a student is selected at random, find the
probability the student is a female given that it's a
junior.
Using it's concept, the desired probability is:
P(Female|Junior) = 75%.
What is a probability?A probability is given by the number of desired outcomes divided by the number of total outcomes.
In this problem, there are 8 Junior Students, out of which 6 are Female, hence the probability is:
P(Female|Junior) = 6/8 = 0.75 = 75%.
More can be learned about probabilities at https://brainly.com/question/24372153
#SPJ1
The amount of money spent buying packets of instant noodles varies directly
with the number of packets purchased. If 30 packets of noodles cost $34.88,
how much would 45 packets cost? Round all answers to the nearest hundredth
in your calculations.
A. $38.70
B. $52.20
C. $25.83
D. $43.00
The cost of 45 packets of instant noodles given the direct variation is $52.335
Direct variationlet
Amount spent on noodles = nNumber of Packets purchased = pn = k × p
Where,k = constant of proportionality
34.88 = k × 30
34.88 = 30k
k = 34.88/30
k = 1.16266666666666
Approximately,
k = 1.163
Find n when p = 45
n = k × p
= 1.163 × 45
n = $52.335
Learn more about variation:
https://brainly.com/question/6499629
#SPJ1
One number is 2 less than a second number. Twice the second number is 5 less than 3 times the first. Find the two numbers.
Answer:
9 and 11
Step-by-step explanation:
First number = x -2
Second number = x
and 2x = 3(x-2) - 5
2x = 3x - 6 - 5
x = 11
first number = 11-2 = 9
HELP QUICK! You must find all intervals
where f(x) is negative.
f(x)=2(x+3)(x-7)
Answer:
any # where -2<=x<7
Step-by-step explanation:
(x-7) would be negative and (x+3) positive, resulting in f(x) being negative.
Samantha is going to run in a 5K race. To prepare, she wants
to run an average of 40 minutes a day until the marathon
on Saturday. She ran 45 minutes on Monday, 30 minutes on
Tuesday, 55 minutes on Wednesday, and 25 minutes on
Thursday. How long should she run on Friday to reach her
goal?
The number of minutes Samantha needs to run on Friday to reach her goal is 45 minutes.
AverageMonday = 45 minutesTuesday = 30 minutesWednesday = 55 minutesThursday = 25 minutesFriday = x minutesAverage = (Monday + Tuesday + Wednesday + Thursday + Friday) / 5
40 = (45 + 30 + 55 + 25 + x) / 5
40 × 5 = 155 + x
200 = 155 + x
200 - 155 = x
45 = x
x = 45 minutes
Learn more about average:
https://brainly.com/question/20118982
#SPJ1
What is the relationship between the lines determined by the following two equations?
15x−3y=−12
y = 5x + 7
They are the same line.
neither parallel nor perpendicular
perpendicular
parallel
Answer:
D
Step-by-step explanation:
to determine the relationship between these two lines you have to find the slope.
=> if they have the same slope ,then they are parallel.
=> if they have negative inverse slope relative to each other ,then they are perpendicular.
=> if the slope for both equations is neither of the above cases ,then the two equations are neither parallel nor perpendicular.
so if we divide the first equation by 3 which is the commen factor for the whole equation and arrange it in the form y=mx +b it would give us y =5x +4. and since the two have the same slope which is 5 ,then we can conclude they are parallel lines.
suppose that prices of a certain model of new homes are normally distributed with a mean of $150000. Use the 68-95-99.7 rule to find the percentage of buyers who paid: between $150000 and $154800 if the standard deviation is $1600
Using the Empirical Rule, it is found that 49.85% of buyers paid between $150,000 and $154,800.
What does the Empirical Rule state?It states that, for a normally distributed random variable:
Approximately 68% of the measures are within 1 standard deviation of the mean.Approximately 95% of the measures are within 2 standard deviations of the mean.Approximately 99.7% of the measures are within 3 standard deviations of the mean.Considering the given mean and standard deviation, the interval between $150,000 and $154,800 corresponds to the interval between the mean and 3 standard deviations above the mean.
The normal distribution is symmetric(50% above the mean, 50% below), hence the percentage corresponding to this interval is:
P = 0.5 x 99.7% = 49.85%.
More can be learned about the Empirical Rule at https://brainly.com/question/24537145
#SPJ1
I need help with this question please!
the price that they should charge on the 2 year extended warranty is in order to break even is $10.
what price should the company charge?the price at which the company would breakeven is:
= percentage of product that will fail x replacement cost
solving gives:
= 4% x 250
= $10
find out more on warranty cost at https://brainly.com/question/25750069.
#SPJ1
mean mark of 3,2,0,1,9,12,3,5
Answer:
4.375
Step-by-step explanation:
First add all the numbers together. [tex]3+2+0+1+9+12+3+5=35[/tex] Second, divide the number you just got by how many numbers there are. [tex]35/8=4.375[/tex] Therefore, the mean is 4.375.
find the least number that must be subtracted from 21 2o show the result is a perfect square
Answer:
5
Step-by-step explanation:
2 × 2 = 4
3× 3 = 9
4 × 4 =16
5 × 5 =25
16 is the only number and closest number to 21 to subtract from
1. Find the volume of the pyramid.
5 in
11 in
9 in
74
The volume of the pyramid with the given length, width and height is 165in³.
What is the volume of the pyramid?The volume of a right rectangular pyramid is expressed as;
V = ( L × W × H ) / 3
Given that;
Length L = 11inWidth W = 9inHeight H = 5inWe substitute into the equation above.
V = ( L × W × H ) / 3
V = ( 11in × 9in × 5in ) / 3
V = 495in³ / 3
V = 165in³
The volume of the pyramid with the given length, width and height is 165in³.
Learn more about volume of pyramid here: brainly.com/question/17615619
#SPJ1
A recent study of 28 city residents showed that the mean of the time they had lived at their present address was 9.3 years. The standard deviation of the population was 2 years. Find the 90% confidence interval of the true mean? Assume that the variable is
approximately normally distributed. Show all your steps
Answer:
We are 90% confident that the true mean lies between 8..6563 and 9.9437
Step-by-step explanation:
The mean of your estimate plus and minus the range of that estimate constitutes a confidence interval. Within a specific level of confidence, this is the range of values you anticipate your estimate to fall within if you repeat the test. Confidence is another word for probability.
mean (x) = 9.3
standard deviation (s) = 2
sample size (n) = 28
T- Distribution:
degree of freedom = n - 1 = 28 - 1 = 27
90% Confidence Interval ==> α = 0.1
critical value, t = 1.703 ( t-table)
standard error, SE = s/√n = 2 /√28 = 0.3780
margin of error, E = t × SE= 1.703 × 0.3780 = 0.6437
Confidence Interval: x ± E = 9.3 ± 0.6437
lower limit: x - E = 9.3 - 0.6437 = 8.6563
upper limit: x + E = 9.3 + 0.6437 = 9.9437
Confidence Interval: 8.6563 < µ < 9.9437
Z - Distribution:
Formula: Confidence Interval = x ± z (s/√n)
Sample Mean = s/√n = 2/√28 = 2/5.29 = 0.3781
z = 1.645 (from z - table)
From formula, z (s/√n): 0.3781 x 1.645 = 0.620 (rounded)
x ± 0.62
lower limit: x - 0.62 = 9.3 - 0.62 = 8.68
upper limit: x + 0.62 = 9.3 + 0.62 = 9.92
Confidence Interval: 8.68 < µ < 9.92
Learn more about Confidence Intervals here: https://brainly.com/question/2141785
7. How many triangles exist when the angle measures are 90°, 90°, and 0°? 2 POINTS
Answer: None
Step-by-step explanation:
There is no triangle with an angle measure of 0 degrees.
The sum of two numbers is 21. Three times the larger is equal to four times the smaller.
Find them.
Simplify....
[tex] \frac{1}{a + 1} + \frac{1}{a - 1} - \frac{2a}{ {a}^{2} + 1 } - \frac{4a}{ {a}^{4} + 1 } \\ [/tex]
please help ty~
The simplified expression of [tex]\frac{1}{a + 1} + \frac{1}{a - 1} - \frac{2a}{a^2 + 1} - \frac{4a}{a^4 + 1}[/tex] is [tex]\frac{8a}{a^8 - 1}[/tex]
How to simplify the expression?The expression is given as:
[tex]\frac{1}{a + 1} + \frac{1}{a - 1} - \frac{2a}{a^2 + 1} - \frac{4a}{a^4 + 1}[/tex]
Add the first two terms
[tex]\frac{a - 1 + a + 1}{(a + 1)(a - 1)} - \frac{2a}{a^2 + 1} - \frac{4a}{a^4 + 1}[/tex]
Evaluate
[tex]\frac{2a}{a^2 - 1} - \frac{2a}{a^2 + 1} - \frac{4a}{a^4 + 1}[/tex]
Evaluate the first two terms
[tex]\frac{2a^3 + 2a - 2a^3 + 2a}{(a^2 - 1)(a^2 + 1)} - \frac{4a}{a^4 + 1}[/tex]
Evaluate
[tex]\frac{4a }{a^4 - 1} - \frac{4a}{a^4 + 1}[/tex]
Take the LCM
[tex]\frac{4a^5 + 4a - 4a^5 + 4a }{(a^4 - 1)(a^4 + 1)}[/tex]
Evaluate the like terms
[tex]\frac{8a}{a^8 - 1}[/tex]
Hence, the simplified expression is [tex]\frac{8a}{a^8 - 1}[/tex]
Read more about expressions at:
https://brainly.com/question/723406
#SPJ1