In a class 22 of students, 10 have a brother and 11 have a sister. There are 4 students who have a brother and a sister. What is the probability that a student chosen randomly from the class has a brother?

Last year the winner of the 50-meter swim finished the race in 27.609 seconds. This year winners completed the 50-meter swim in 0.032 fewer seconds. How long did it take this year to swim 50 meters?

Two numbers are in the ratio of 4 to 7. Their sum is 55. What are the two numbers?

Function f (x) is positive, increasing and concave up on the closed interval [a, b]. The interval [a, b] is partitioned into 4 equal intervals and these are used to compute the upper sum, lower sum, and trapezoidal rule approximations for the value

2. Reported Versus Measured In a survey of 1046 adults conducted by Bradley Corporation, subjects were asked how often they wash their hands when using a public restroom, and 70% of the respondents said "always." a.

Which situation is best represented by the following equation?3x+x=440

Two identical urns contain balls. Urn1 has 3 red balls, 3 green balls, and 3 blue balls. Urn2 has 4 red balls and 6 blue balls. An urn is chosen at random and a ball is drawn at random from this urn.

Issac drink 8 glasses of water each day. He says he will drink 2920 glasses of water in a year that has 365 days. Is it the exact answer reasonable?

706,421 rounded to the neares thousand

Solve P=R-C=XP-C P=140-0.001x C=40x/150,000

Which statements are true? Check all that apply. The function that best represents the data is f (x) = 24,512 (0.755) x. The function that best represents the data is f (x) = 554x2 - 5,439x + 24,600. The function decreases indefinitely.