elementary math activities

A certain radio active isotope has half - life of 20 days. If one starts with 80 kg of the isotope, then how much is left after 8 days? => 60 kg or 36 kg or 42 kg or 32 kg or 38 kg..

A magazine advertises 5 different movies, 3 plays and 2 basketball games for the weekend. If a couple selects 3 activities, then find the probability that they attend 2 plays and 1 movie. => 3 10 or 1 15 or 1 2 or 1 8..

The table shows the number of students enrolled in the elementary, the middle, and the high school. Choose the bar graph that represents the data given in the table. Year Elementary school Middle school High school 1985 34 13 14 1990 36 14 10 1995 38 14 14 2000 37 15 15 => Graph..

Andrew's activities in a day are shown in the table. What percent of time does he spend sleeping? Activities Hours per day Sleeping 7 School 5 Eating 2 Home work 3 Others 7 => 39% or 41% or 34% or 29%..

Charlie's regular activities in a day are shown in the table. What percent of time does he spend sleeping? Activities Hours per day Sleeping 6 School 7 Eating 3 Home work 2 Others 6 => 35% or 37% or 30% or 25%..

The frequency table shows the school enrolment (in thousands) in the year 2000. Let C represents california. Pre primary Elementary or high school College or graduate school California 1101 6472 2557 New Jersey 303 1444 470 Use the table to find P(C). => 79% or 82% or 61% or 91%..

The frequency table shows the school enrolment (in thousands) in the year 2000. Let N represents New Jersey and R represents Pre primary school. Pre Primary Elementary or high school College or graduate school California 1101 6472 2557 New Jersey 303 1444 470 Use the table to find P(R | N..

A survey conducted by the Education Department reveals the expenditures on the Secondary and the High schools. Pick an appropriate bar graph which represents the data shown in the table. Year Elementary & Secondary school (in $millions) High school (in $millions) 1985 325 275 1990 361 275..

Choose the matrix after performing the elementary row operation 5R 1 + R 2 on the matrix ( 1 4 3 2 0 1 1 -1 2 ) . => ( 1 -4 3 2 0 1 -11 -1 2 ) or ( 11 14 3 2 0 11 1 -1 2 ) or ( 1 4 3 7 20 16 1 -1 2 ) or ( 1 4 13 2 10 1 1 -1 ..

A surveyor asked a group of people what would they like to do in their free time. The results are recorded in the table. Find the experimental probability of a person interested in reading magazines in his/her free time. Activity Number of people Shopping 24 Watching T.V. 28 Reading Magaz..