Calcule o valor de x nos casos abaixo, sabendo que y = 3. a) 7x + 2y + x + 2y = 0 b) 2x + 3y - x + 3x = 5 c) 1/3x + 1/5y = 0 d) 1/2x + 1/3x + 1/4y = 2 e) 0,25x - 0,30x - 0,35x + 1,2y = 2 f) 0,25x - 0,3y - 0,35y + 1,20y = 0 alguém consegue me ajudar com esses exercícios por favor?

Adifferent website gives the cost for the first train as £56.88 and the second train as £20.11 with a £9.50 charge for cycle storage for the whole trip. how much would the journey cost you?

Ling listed all of the factors of a mystery number: 1,2,4,8,16,32 what is the mystery number?

For a science project, a high school research team conducted a survey of local air temperatures. based on the results of the survey, the found that the average temperatures were around 10 degrees higher than expected. this result was wrong. the trouble with the survey was that most of the locations were exposed to direct sunlight and located over asphalt or sand, which resulted in higher temperatures than normal. this is a classic example of an error in which phase of inferential statistics?