you find a rock containing a mixture of element and lead. you determine that 20% of the orignial element remain; the other 80% decayed into leads. how old is the rock?

In a class of 27 students, five students have 1 pet. Three students have 2 pets. Four students have 3 pets. Two students have 4 pets. One student has 8 pets. The remaining twelve students do not have any pets.

If a sample mean is 32, which of the following is most likely the range of possible values that best describes an estimate for the population mean?

The height to length ratio of a brick wall is 3:20. The wall Is 40 feet long. How high is it

A store is having a sale on chocolate chips and walnuts. For 7 pounds of chocolate chips and 9 pounds of walnuts, the total cost is $53. For 5 pounds of chocolate chips and 3 pounds of walnuts, the total cost is $25.

Two cylinders are similar with a scale factor of 1:4. Which shows the ratio of the volumes of the cylinders? a. 1:16 b. 3:16 c. 1:64 d. 3:64 e. 3:12

while playing basketball, jada's heart rate goes up to 160 beats per minute. whe jogging her heart beats 25 times in 10 seconds.

What does 12 times a number mean as an expression?

Emma seys that the preduct of a 3-digit number and a 1-digit number will be either a 3 digit number or a 4 digit number. Does Emma's statement make sense

Work out the value of these two questions: 1) 3^2 + 2^3 2) 2^4 - 3^2

What is 5 1/4 divided 2 2/7