If r(x)=3-9x+3 , find the following

r(-1) (simplify answer)

r(-1) = 15

Step-by-step explanation:

3 * (-1)^2 - 9 (-1) + 3

3 * 1 +9 + 3

3+9+3

15

3< x< 5

step-by-step explanation:

|x - 4| < 1

there are two solutions, one positive and one negative.   remember to flip the inequality when taking the negative solution

x-4 < 1       x-4 > -1

add 4 to each side

x-4+4 < 1+4       x-4+4 > -1+4

x< 5                 x> 3

3< x< 5