Please help Select the correct answer. Which value of x makes this equation true?
-12.1 2(1 + 9) = 5(2 + 4)
O A 5
OB.
-2
oc -
-
OD.
13
19

Find the product of (4x + 3y)(4x − 3y). 16x2 − 24xy + 9y2 16x2 − 9y2 16x2 + 24xy + 9y2 16x2 + 9y2

If f(x)=2x-6 and g(x)=3x+9, find (f-g)(x)

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?