Find a formula for the nth term of the sequence in terms of n. one ninth comma two twelfths comma StartFraction 2 squared Over 15 EndFraction comma StartFraction 2 cubed Over 18 EndFraction comma StartFraction 2 Superscript 4 Over 21 EndFraction comma ... 1 9 , 2 12 , 22 15 , 23 18 , 24 21 , ... a Subscript n an equals = nothing for n greater than or equals 1 n≥1

Find the value of x for which the lines are parallel.

What is the value of x in the equation (2)3) (x+6)= -18 a. -36 b. -33 c. -24 d. -18

Each person in an it department of 25 people works on at least one of 3 major projects: system security, program implementation, platform development. 10 people work on system security, 13 work on program implementation, and 12 work on platform development. 4 people work on system security and platform development, 5 people work on program implementation and platform development, and 2 people work on all three projects. how many people work on system security and program implementation?