Why are scientific models important?
a. they prove scientific theories.
b. they visualize thing that are very complex. very large. and very small
c. they make it harder to understand things.
d. they never change.

"you know, playing tennis is healthier than watching a tennis match on television," katya remarked to her couch potato brother. in this sentence, healthier is a/an a. superlative. b. comparative. c. positive form. d. adverb.

The table above shows approximate conversions from gallons to liters. what is the value of x?

Divide the following fractions 3/4 ÷ 2/3 1/2 8/9 9/8 2