John collected 10 baseball cards. Carlen collected twice as many as John. How many cards did they collect together?

In the football stadium, there are 18 empty seats out of 360 total seats. (1a) write the ratio of empty seats to total seats as a fraction in simplest form. (1b) then explain its meaning.

After two years, how much has been paid into interest?

Find the value of x. round the length to the nearest tenth