Use variation of parameters to solve the given nonhomogeneous system. X' = -7t

Let R represent the number of people in a town who have recovered from an illness d days after the beginning of the infection. for d 10 3d R(d) = { 30 a. Find R(7)= b. Find R(20)=.

fx+ h) -f(x) hz 0. Compute and simplify the difference quotient f0) = 8-X Select one: OA. (8-x+h)(8-x) OB. hx (8-x-h)(8+x) 8. (8-x+h)(8-x) O C 8. OD. (8-x-h)(8-x)

Evaluate / dx x(x+2)³ 2x+1 Select the correct answer below: 금(In |x| + In |x + 2| + 급5 + x+2 (x+2) ) + C ( In |x| – In |x + 2| + 2 6 + C - (x+2)? ! (In |x| – In |x + 2| + =) +C x+2 (x+2)² In |x| – In |x + 2| + + C x+2 (x+2)? 글(In )지 - In Ix + 2| + -) +C x+2 (x+2)?