A sample of rock is found to contain 100 grams of a parent isotope. How many grams of the parent isotope will remain after two half-lives?

Answer

50

100

75

25

A person is standing exactly 36 ft from a telephone pole. There is a 30 degree angle of elevation from the ground to the top of the pole. What is the height of the pole? A. 12 ft B. 12 square root of 3 ft C. 18 ft D. 18 square root of 2 ft

How many seconds are in 2.5 hours

Simplify. 3{[9 (x-2) + 7]-2[4 (x+5) - 36]}

There are 23 students in a math class. 12 of them are boys.

What is the answer to this problem 413 : 19

A stray dog ate 13 of your muffins. that was 3/10 of all of them. with how many did you start with

The length of a rectangle is 10 more than four times the width. The perimeter of the rectangle is 170 inches. Find the length and width.

Mofor's school is selling tickets to the annual talent show. On the first day of ticket sales the school sold 4 senior citizen tickets and 6 student tickets for a total of $96.

2 units left and 3 units down

Eight sided dice can be described as two square based pyramids stuck together at the bases. Their faces are equilateral triangles.