Here I have two problems each for Distance Formula and Midpoint Formula

I have solved these problems but would like to know if I am correct in my solving of the problems.

Distance Forumla

Give exact answer and where appropriate, an approximation to three decimal places.

1) (4,6) and (5,9)

d= √(5-4)² + (9-6)² =

√(1)² + (3)² =

√1+9 =

√10 =

3.162

2) (-11, -8) and (1, -13)

d= √(1-(-11)² + (-13 -(-8)² =

√(1+11)²+ (-13+8)² =

√(12)² + (-5)² =

√144 + 25 =

√169 =

13

Mid Point Formula

1) (4, -9) and (-12, -3) =

(4+ -12)/2, (-12 + -3)/2 =

(-8)/2, (-15)/2 =

(-4, -7.5)

I didn't know if I should have left the answer for (-12 + -3)/2 as a fraction instead of actually dividing it and getting a decimal.

2) (0, 1/2), (-2/5, 0) =

(0+1/2)/2, (-2/5 +0)/2 =

(1/2, -2/5) this is supposed to be a fraction and not divided by 2 at this point of the problem. This is the answer I got.

Please let me know where I might have went astray or if I do well on these particular problems. Any help would be appreciated as I don't really know what I am doing.

Thanks Much,

Tricey36