1/10, since there's 2 winning possibilities out of 20 altogether.
10.
Which of the following is the maximum value of the function y = −2x2 + 5?
A. 0
B. 5
C. 25
D. −2
Answer:
Step-by-step explanation:
Hello, the answer in this case would have to be 5 as the vertex of the lowest point of 0.
Therefore x would have to be 0.
Answer:
A. 0
Step-by-step explanation:
Use the formula x = − b /2 a to find the maximum and minimum.
( 0 , 5 )
Help me for 100 points yessir thanks you
Answer:
Step-by-step explanation:
A manufacturer of electronic kits has found that the mean time required for novices to assemble its new circuit tester is 3 hours, with a standard deviation of0.20 hours. A consultant has developed a new instruc- tional booklet intended to reduce the time an inexpe- rienced kit builder will need to assemble the device. In a test of the effectiveness of the new booklet, 15 nov- ices require a mean of 2.90 hours to complete the job. Assuming the population of times is normally distrib- uted, and using the 0.05 level of significance, should we conclude that the new booklet is effective? Determine and interpret the p-value for the test.( DATA SET ) Note: Exercises 10.33 and 10.34 require a computer and statistical software.
Testing the hypothesis using the z-distribution, it is found that since the p-value of the test is of 0.0262 < 0.05, it can be concluded that the new booklet is effective.
At the null hypothesis, we test if there has been no improvement, that is, the time is still of 3 hours. Hence:
[tex]H_0: \mu = 3[/tex]
At the alternative hypothesis, we test if there has been improvement, that is, the time is of less than 3 hours. Thus:
[tex]H_1: \mu < 3[/tex]
We have the standard deviation for the population, thus, the z-distribution is used. The test statistic is given by:
[tex]z = \frac{\overline{x} - \mu}{\frac{\sigma}{\sqrt{n}}}[/tex]
The parameters are:
[tex]\overline{x}[/tex] is the sample mean.[tex]\mu[/tex] is the value tested at the null hypothesis.[tex]\sigma[/tex] is the standard deviation of the population.n is the sample size.In this problem, the values of the parameters are: [tex]\mu = 3, \sigma = 0.2, \overline{x} = 2.9, n = 15[/tex].
Then, the value of the test statistic is:
[tex]z = \frac{2.9 - 3}{\frac{0.2}{\sqrt{15}}}[/tex]
[tex]z = -1.94[/tex]
The p-value of the test is the probability of finding a sample mean of 2.9 hours or less, which is the p-value of z = -1.94.
Looking at the z-table, z = -1.94 has a p-value of 0.0262.
Since the p-value of the test is of 0.0262 < 0.05, it can be concluded that the new booklet is effective.
A similar problem is given at https://brainly.com/question/25413422
What does 312,819 round to, to the nearest ten thousand?
Answer:
310,000
Step-by-step explanation:
A tortoise or land turtle might cover about 450 feet in half an hour. What is this speed in feet per minute.
Please explain step by step and I’ll mark you brainliest!
Answer:
15 feet per minute.
Step-by-step explanation:
speed = distance ÷ timespeed = 450 feet ÷ 30 minutes15 feet per minute = 450 feet ÷ 30 minutesin order to select new board members, the french club held an election. 8 members voted in the election and 42 did not vote. what percentage of the members voted
Answer:
16%
Step-by-step explanation:
If you do 8+42, you will find out there are 50 members. Do 8/50 and you get 0.16. Multiply it by 100 and you get your answer of 16, add the percentage at the end. Then you get your answer of 16%.
Answer:
16%
Step-by-step explanation:
Total members: 8+42 = 50
What percentage is 8 of 50
x/100 = 8/50
(8 * 100) / 50 = 16%
Solve this equation by completing the square 2 −12 + 36 = 44. Show your work. No other method will be accepted
Iḿ sorry I cannot be specific but it´s either 12.633 or 0.6.33
Sorry if it is not helpful
The survey below shows a science test grades from one state
What type of graph would be the most appropriate to use to graph the information
A. Double bar graph
B. Line graph
C. Histogram
D. Double line graph
What are the solutions to the following equation?
Answer:
What equation?
Step-by-step explanation:
A sum of money is shared among Ben, jack, and Sarah in the ratio 6:8:10. If Sarah receives $50 how much does Ben receive?
Step-by-step explanation:
Sarah receives $50 in ratio 10
if 10÷2=5
$50÷2=25
hence 6=1
1=x Cross Multiply
6x÷6 = 1÷6
x = 0.1666…
Hence Ben gets ($50÷2+{0.1666…})
$25+0.166… = $25.166…
.A study of 800 homeowners in a certain area showed that the average value of the homes was $82,000, and the standard deviation was $5000. If 50 homes are for sale, find the probability that the mean of the values of these homes is greater than $83,500.
There is 1.70% that 50 homes have a value greater than $83,500.
Z score is used to determine by how many standard deviations the raw score is above or below the mean. It is given by:
[tex]z=\frac{x-\mu}{\sigma/\sqrt{n} } \\\\where\ x=raw\ score,\mu=mean,\sigma=standard \ deviation,n=sample\ size[/tex]
μ = $82000, σ = 5000, n = 50. Hence for x > 83500:
[tex]z=\frac{83500-82000}{5000/\sqrt{50} }\\\\\\z=2.12[/tex]
From the normal distribution table, P(x > 83500) = P(z > 2.12) = 1 - P(z < 2.12) = 1 - 0.9830 = 0.0170 = 1.70%
Find out more at: https://brainly.com/question/7449180
The angles of a triangle add up to 180 degrees.
The second angle is 25 degrees larger than the smallest angle.
The third angle is 3 times as big as the smallest angle.
Find the measure of the smallest angle (in degrees)
what is 10000 times 12
Answer: 120,000
Step-by-step explanation:
10,000 x 12 = 120,000
what is 5 ft to 18 in.
Answer:
68 inches
Step-by-step explanation:
its sixty eight inches
Complete each short proof by providing the reason.
Answer:
B) Substitution Property of EqualityStep-by-step explanation:
According to the given:
m∠2 + m∠5 = 180° andm∠5 = 90°Substitute m∠5 into the first line to get line 3:
m∠2 + 90° = 180°This is option B:
Substitution Property of EqualityOption C
This is substitution property of inequality
Here given two expressions
m<2+m<5=180°m<5=90°Substitute m<5 in eq(1)
m<2+90=180m<2=180-90m<2=90HELP ASAP WILL MARK BRAINLIEST PLEASE!!
Express your answers in simplest form. An isosceles triangle has a base with a measure of u cm. If the triangle has a perimeter of 16 cm, what is the measure of one of its legs in terms of u?
Given the figure below, find the values of x and z.
Answer:
x=5, z=107
Step-by-step explanation:
z=107 (vert opp angles)
z+13x+8=180 (adj angles on a str line)
107+13x+8=180
13x+115=180
13x=180-115
=65
x=65÷13
=5
A restaurant wants to test a new in-store marketing scheme in a small number of stores before rolling it out nationwide. The new ad promotes a premium drink that they want to increase the sales of. 20 locations are chosen at random and the number of drinks sold are recorded for 2 months before the new ad campaign and 2 months after. The 90% confidence interval to estimate the true average difference in nationwide sales quantity before the ad campaign and after is (3.96, 28.79). Which of the following is the appropriate conclusion?
1) We are certain the average difference in sales quantity between after the ad campaign to before for all stores is between -3.83 and 1.83.
2) We are 95% confident that the difference between the average sales after the ad campaign and the average sales before the ad campaign is between-3.83 and 1.83.
3) The proportion of all stores that had a difference in sales between after the ad campaign to before is 95%.
4) We are 95% confident that the average difference in the sales quantity after to before of the stores sampled is between -3.83 and 1.83.
Answer:
2 or 4
Step-by-step explanation:
Help this is due today!!!!
Answer:
The second option: 3.5x+685[tex]\leq \\[/tex]85
Step-by-step explanation:
The addition fee is 6 meaning adding not subtracting. Cancel out the first and last one. Then, it says without going over. Meaning it could equal exactly $85. Which means [tex]\leq[/tex]. So it would be the second option.
hi people a pus 7 a= 16000
Answer:
A=2285.71428571 or rounded up is 2286
Step-by-step explanation:
7A=16000
7. 7
A=2286
Divide 7A to get A alone
:D hope i was able to help
What kind of decimal is 0.05? How do you know?
Answer:
0.05 is a terminating decimal
Step-by-step explanation:
0.05 is a terminating decimal because it has finite digits.
Answer:
a terminating decimal
Step-by-step explanation:
it has finite digits and when 1 is divided by 20, it leaves no remainder
mark me brainliest :D
Heidi must pay 7.25% sales tax on her purchase of $25. Which expression can be used to calculate the amount of sales tax she must pay?
Answer: $1.81
Step-by-step explanation:
x=a(amount of money) * b(tax)
y=1/2(x+8)+3 please show work also write in y=mx+b
Answer:
y = 1/2x + 7
Step-by-step explanation:
y= mx + b is written in slope- intercept form. Plug in the numbers.
you distribute 1/2 to x and to 8
y= 1/2x + 4 + 3
simplify
y= 1/2x + 7
the problem can't be anymore simplified
If you have any questions pls ask!
2/3(x-6)=6 what value does x have to be to get 6
Answer:
The X would have to be 12!
Step-by-step explanation:
Because 2/3 is 6, 6 x 2 = 12 - 6 = 6
Answer:
15
Step-by-step explanation:
Using gemdas you would have to work in the parenthesis first and 15-6 is 9 multiplied by 2/3 is 6
How to write the value of 17 tens in standard form
HELP PLEASE!
I need the answer please!
Answer:
The triangles are similar in that the smaller triangle was dilated by a scale factor of 1/4 which means that the length of the missing side is 20m
Step-by-step explanation:
Is p→q≡∼p∨q true or false?
Show that (p → q) ∨ (p → r) and p → (q ∨ r) are logically equivalent. By the definition of conditional statements on page 6, using the Com- mutativity Law, the hypothesis is equivalent to (q ∨ ¬p) ∨ (¬p ∨ r). ... This means that the conditional from the second-to-last column the last column is always true (T).
The width of a rectangular painting is 3 in. less than the length. The area of the painting is 40 in ^2 .Find the length and width.
Answer:
Mark me as brainlist
Step-by-step explanation:
a) (h + 5)(2h + 8) is the expression for the combined area of the painting and frame
b) The combined area when h = 12 is 544 square inches
c) The combined area when h = 15 is 760 square inches
Solution:
Given that,
A frame that is 2.5 inches wide goes around the painting
The frame will go around all 4 sides of the painting.
That means that the length of each side of the painting will increase by 2.5 inches
Therefore,
The height of painting and frame is:
h = h + 2.5 + 2.5
h = h + 5
(2.5 inches on the top and the bottom)
Also given that,
Width of a rectangular painting is 3 inches more than twice the height
w = 3 + 2h
Now the width of painting and frame is:
w = 3 + 2h + 2.5 + 2.5
(Again, 2.5 inches on the top and the bottom)
w = 2h + 8
Thus the combined area of the painting and frame is:
B) Substitute h = 12 inches
Thus the combined area when h = 12 is 544 square inches
C) Substitute h = 15 inches
Thus combined area when h = 15 is 760 square inches
6. Light travels about 180 million kilometers in 10 minutes. How far des trave
minute? How far does it travel in 1 second? Show your reasoning,
from Unit 2, Lesson 9.)
260 Student Edition
Grates in KM
Answer:
The light travels distance in 1 minute=18 million kilometers
The light travels distance in 1 second=0.3 million kilometers
Step-by-step explanation:
We are given that
Light travels total distance in 10 minutes=180 million kilometers
We have to find the distance travels by light in 1 minute and in 1 seconds.
By unitary method
Distance travel by light in 1 min=million kilometers=18 million kilometers
Distance travel by light in 1 min=18 million kilometers
We know that 1 minute=60 seconds
In 60 seconds, light travels distance =18 million kilometers
In 1 second, light travels distance = million kilometers
Hence, the light travels distance in 1 minute=18 million kilometers
The light travels distance in 1 second=0.3 million kilometers
Hope this helps, have a nice day/night! :D
How many different four-digit numbers can be formed with the numbers 7; 4; 5; 1; 2; 9; and 8?
Answer:
I believe it's 2401.
Step-by-step explanation:
7 x 7 x 7 x 7 = 2401
Answer:
2 answers.
Step-by-step explanation:
ANSWER 1: With Repetition
Numbers: 1,2,4,5,7,8
There are 4 digits __ __ __ __
1st digit can be filled by any of the 6 numbers.
Similarly 2nd, 3rd and 4th digits.
Hence each digit will have 6 possibilities.
Therefore no.of 4 digit numbers that can be formed are 6 x 6 x 6 x 6 = 1296
ANSWER 2: Without Repetition
4 digits __ __ __ __
Now the first digit can be filled by any of the six numbers. Therefore there are 6 possibilities
The second digit will have only 5 possibilities as one of the numbers gets used up by the 1st digit.
Similarly the 3rd and 4th digits will have 4 and 3 possibilities respectively.
Therefore no.of 4 digit numbers that can be formed are 6 x 5 x 4 x 3 = 360
