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MATH SOLVE
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General
Use the facts that the negation of a ∀ statement is a ∃ statement and that the negation of an if-then statement is an and statement to rewrite the statement without using the words necessary or sufficient. Having a large income is not a necessary condition for a person to be happy.
General
4 months ago
Troy and Lisa were shopping for school supplies. Each purchased different quantities of the same notebook and thumb drive. Troy bought 6 notebooks and 7thumb drives for 185$. Lisa bought 14 notebooks and 12 thumb drives for 332$. Find the cost of each notebook and thumb drive
General
4 months ago
A country's current population is 100 million with an annual growth rate of 3.5%. If the growth rate remains constant, what will be the population in 40 years?
General
4 months ago
A is 11 years old and B is 68 years old. In how many years will B be just 4 times as old as A?Please give me a step-by-step explanation!100 points to brainliest!!!
General
4 months ago
The second of three number is 1 less than the first the third number is 5 less than the second if the first number is twice as large as the third find the three number
General
4 months ago
A rumor spreads through a school. Let y(t)y(t) be the fraction of the population that has heard the rumor at time tt and assume that the rate at which the rumor spreads is proportional to the product of the fraction yy of the population that has heard the rumor and the fraction 1−y1−y that has not yet heard the rumor.
General
4 months ago
At wind speeds above 1000 centimeters per second (cm/sec), significant sand-moving events begin to occur. Wind speeds below 1000 cm/sec deposit sand and wind speeds above 1000 cm/sec move sand to new locations. The cyclic nature of wind and moving sand determines the shape and location of large dunes. At a test site, the prevailing direction of the wind did not change noticeably. However, the velocity did change. Sixty wind speed readings gave an average velocity of x = 1075 cm/sec. Based on long-term experience, σ can be assumed to be 270 cm/sec. Find a 95% confidence interval for the population mean wind speed at this site.
General
4 months ago
stat: sample of 780 adults in the U.S.A., it was found that 80 of those had a pinworm infestation. You want to find the 99% confidence interval for the proportion of all U.S. adults with pinworm, In a prior sample of U.S. adults, the Center for Disease Control (CDC), found that 10% of the people in this sample had pinworm but the margin of error for the population estimate was too large. They want an estimate that is in error by no more than 2.5 percentage points at the 95% confidence level.What is the minimum sample size required to obtain this type of accuracy?
General
4 months ago
Suppose a chef claims that her meatball weight is less than 4 ounces, on average. Several of her customers do not believe her, so the chef decides to do a hypothesis test, at a 10% significance level, to persuade them. She cooks 14 meatballs. The mean weight of the sample meatballs is 3.7 ounces. The chef knows from experience that the standard deviation for her meatball weight is 0.5 ounces. H0: μ=4; Ha: μ<4 α=0.1 (significance level) What is the test statistic (z-score) of this one-mean hypothesis test, rounded to two decimal places? Provide your answer below:
General
4 months ago
This monitor has a diagonal length of 19 inches and an aspect ratio of 5:4. What are the width and height of the monitor? Round to the nearest tenth of an inch.
General
4 months ago
coin is flipped four times. For each of the events described below, express the event as a set in roster notation. Each outcome is written as a string of length 4 from {H, T}, such as HHTH. Assuming the coin is a fair coin, give the probability of each event. (a) The first and last flips come up heads. (b) There are at least two consecutive flips that come up heads. (c) The first flip comes up tails and there are at least two consecutive flips that come up heads.
General
4 months ago
The mean life span of a brand name tire is 50,000 miles. Assume that the life spans of the tires are normally distributed, and the population standard deviation is 800 miles. a. If you select one tire, what is the probability that its life span is less than 48,500 miles? b. If you select 100 tires, what is the probability that their mean life span is more than 50,200 miles?
General
4 months ago
In the 6/55 lottery game, a player picks six numbers from 1 to 55. How many different choices does the player have if repetition is not allowed? Note that the order of the numbers is not important.
General
4 months ago
A certain company has 255 employees. If an employee is to be selected at random from the company's employees, is the the probability less than 1/2 that the employee selected will be a woman who has a college degree?(1) 130 of the company's employees do not have a college degree(2) 125 of the company's employees are men
General
4 months ago
Consider the sequence: 5, 7, 11, 19, 35,....Write an explicit definition that defines the sequence: a_n = 2n + 3a_n = 3n + 2a_n = 3n^2a_n = 2^n + 3
General
4 months ago
A sphere with a radius of 6 cm has the same volume as a cone with a height of 6 cm. What is the radius of the cone?A) 2 cm B) 4 cm C) 8 cm D) 12 cm
General
4 months ago
kiaria is 7 years alder tham jay . martha is twice as old as kiaria , the sum of their three ares is 7u , find the ratio of jay,s age to kiatias age to marhas age
General
4 months ago
For a standardized psychology examination intended for psychology majors, the historical data show that scores have a mean of 505 and a standard deviation of 170. The grading process of this year's exam has just begun. The average score of the 35 exams graded so far is 530.What is the probability that a sample of 35 exams will have a mean score of 530 or more if the exam scores follow the same distribution as in the past?
General
4 months ago
the circular ripple caused by dropping a stone in a pond is increasing in area at a constant rate of 20 square meters per second. Determine how fast the radius of this circular ripple is increasing when the area of the circular region is 25 pi
General
4 months ago
A bag contains purple marbles and white marbles, 34 in total. The number of purple marbles is 1 less than 4 times the number of white marbles. How many purple marbles are there?
General
4 months ago
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