In the united states in 1980 approximately 60 million families had TV's in their home. In 2015 there was almost 100 million families that had TV's in their home. Approximately how many more TV's were there in 2015?

Amir wants to proportionally increase the size of a photo to create a poster for his room. the size of the original photo is shown. complete the statement and then answer the question to represent ways that amir can increase the size of his photo.

How many 3-digit numbers can you write using only digits 1 and 7? (of course, digits can repeat.) how many 3-digit numbers can you write using only digits 1 and 7? (of course, digits can repeat.)

Car a and car b were in a race .the driver of car b claimed that his car was twice as fast as car a