The population of oak trees on Mr. Howard’s land has decreased. The table shows the number of trees over a period of years

The half-life of a certain material is 0.004 second. approximately how much of a 20-gram sample will be left after 0.016 second? a. 5 grams b. 16 grams c. 0.32 gram d. 1.25 grams

If the average of x, y and z is 15 what is their sum

The sum of a number and 5 times the number is 18.find the number