Add and subtract fractions and mixed numbers

First of all, we must do the multiplification (due to PEMDAS rules):

1/3 + 5/6

Second, we find and apply the LCD: The LCD is 6, and so we have

2/6 + 5/6 = 7/6 (answer)

1) c 2143.6 cm

2) c 113.0 m

3) a 33.5 ft

4)   d 2 cm

5) c 20 mm

6) 180 in

7) d 120 ft

1. perpendicular

2. parallel

3. perpendicular