The sum of three numbers is 30. twice the first minus the second is 3 less than the third. the third us the second minus three times the first. find the numbers

Three coins are flipped. what is the probability that there will be at least two tails?

Antonio made a scale model of a building. the model's scale is 1 inch to 235 feet and its height is 3.5 inches. what is the exact height of the actual building? enter your answer in the box.

Which of these sequences is a geometric sequence a 1,2,4, 7, 11, 16, 22. b. 2.4.8.14.22.38 c.3.6.9. 15.18,21 d. 3,9,27,81,243,729,