A sample contains 400 Plutonium-244 atoms. After 1 half-life (s) how many plutonium atoms are left on average?

5x+10x+6 find the measure of the angle indicated in bold

How many terms are in this expression 5x + 6y² - 13 + x

1) On a city map drawn on a coordinate plane, the city park is located at (20, 4) and the school is at (20, 9).

What is the word form of 78.6

Juan wants to earn more than $52 trimming trees. He charges $8 per hour and pays $4 in equipment fees. What are the possible numbers of hours Juan could trim trees? Use t for the number of hours. Write your answer as an inequality solved for t.

What is 6/10 simplified

Last month, Ms. Andrea's math class had an average test score of 80. This month, the new average test score is 125% of the previous month's average score. What is the new average test score for the class?

8. If 6x2 = 54, then x = ? (1) 29.0 (2) 3.0 (3) 14.5

Jalen has 30 ounces of a solution that is made of up 30% acid and 70% water. How many ounces of water must Jalen add to this solution to create a solution that is 20% acid and 80% water?

The coordinates A (0,0) B (0,4) and C (2,0) are graphed and connected together. What 3 dimensional shape will be created