PLEASE HURRY Solve each system by elimination. Show your work. Write your answers as ordered triples. 4) 6a - 4b - 4c = 30and -5a - 2b + c = 5and 4a + 6b - 2c = -10 its 3 equations first to answer with work and the right will get brianliest

Do graduates from uf tend to have a higher income than students at fsu, five years after graduation? a random sample of 100 graduates was taken from both schools. let muf be the population mean salary at uf and let mufsu be the population mean salary at fsu. how should we write the alternative hypothesis?

Does the problem involve permutations or? combinations? do not solve. the matching section of an exam has 4 questions and 7 possible answers. in how many different ways can a student answer the 4 ? questions, if none of the answer choices can be? repeated?

Explain how you can use the associative property to evaluate (7x50)x4.