**FIRST CORRECT ANSWER GETS BRAINLEST** y varies directly as x, and y = 0.5 when x = 0.4.
A.) y = 4/5 x
B.) y = 0.1 x
C.) y = 5/4 x
D.) y = 0.9 x

C.) y = 5/4 x

Step-by-step explanation:

5/4 multiplied by 0.4 is 0.5

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

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step-by-step explanation: