+ - decimals
+ - models
+ - decimals
100

#3: 

change greater than 5 to less than 5

B and C

100

#4

0.90 or 0.9

200

# 6

$1.14

200

#8

bottom with only one model

0.57 - 0.29 = 0.28

200

#5

1.5 feet

300

#9

290.23 miles

300

#14

bottom model

0.82 + 0.09 = 0.91

300

#1

C

400

#11

1.36 Liters

400

#16

1st rock: 4.8 lbs

2nd rock: 4.07 lbs

Combined: 8.87 lbs

500

#13

$43.29