If the half-life of a unstable isotope is 10,00 years and only 1/8 of the radioactive parent remains how old is the sample? A. 10,000 B. 20,000 C. 30,000 D. 40,000

Simplify the expression: - 4j - 1 - 4j + 6

Find the product: (-3) (-5) All I managed to gather is to multiple - 3 * - 5 = 15 am I missing a step?

Write the expression 6a-2 (a-1) in simplest form

Rewrite 1 11/25 and 3 3/8 as a square or cube.

A basket is filled with 12 white eggs and 4 brown eggs. half of the white eggs are cracked. an egg is randomly selected from the basket. what is the probability that it is a cracked, white egg?

Can 25, 32, 60 make a right triangle?

Katerina draws a square. she wants to draw one line to divide the square into 2 triangles. is it possible for her to divide the square into 2 obtuse triangles?

9 + (1+43) = (19+1) + 43 what property of addition is it.

Thomas hiked 6 miles on Monday 10 miles on Tuesday and 8 miles on Wednesday which value is closest to the mean number of miles he hiked over the three day period

If 2x-1/3=-4x then x=