The half-life of radium-226 is 1620 years. How much of one gram of radium-226 will remain unchanged after four half-lives?

a) 0.125 g

b) 0.50 g

c) 0.0625 g

d) 0.25 g

Square root of 36x² if x is less than or equal to 0

Estimate with one digit 6/253

Write D + 5 + D + 5 + D + 5 + D + 5 as an equivalent expression by grouping like terms

You have an ice cream scoop with a 2-inch diameter. You have an ice cream cone with a 2-inch diameter and a height of 5 inches. If you place one scoop of ice cream on the cone and let the ice cream melt, will it spill over the cone?

The stress in the material of a pipe subject to internal pressure varies jointly with the internal pressure and the internal diameter of the pipe and inversely with the thickness of the pipe.

Complete the square x^2+2x-7=17 A) x=-1, x=3 B) x=5, x=-4 C) x=-1, x=4 D) x=-6, x=4

There are 5,280 feet in one mile how many feet are in 143 miles?

At the city museum, child admission is $5.40 and adult admission is $8.70. On Friday, 170 tickets were sold for a total sales of $1224.90. How many adult tickets were sold that day?

Becky spent 2/3 of her piano practice time on her recital piece. If she spent 25 min. on other pieces how many hours did Becky spend practicing

8sin (0.3x - 3) + 74,