Twice once number added to another number is 18. If the second number is equal to 12 less than 4 times the first number, find the first two numbers. 2x+y= 12 ; y= __x - __

I really need help with the second part...

Which triangles area would be calculated using the trigonometric area formula

Successful implementation of a new system is based on three independent modules. module 1 works properly with probability 0.96. for modules 2 and 3, these probabilities equal 0.95 and 0.90. compute the probability that at least one of these three modules fails to work properly.

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,