The half-life of a certain radioactive element is 200 years. How will it take for a 100 pound chunk of this element to decay to a chunk that is 50 pounds?

14. factor 6x^3 + 5x^2-18x-15

A rectangle has whole number side lengths that are greater than 1 inch. Is the area of this rectangle a prime or composite number? Explain?

What is 9 3/4 divided by 4 1/8 the answer in the simplest form

A square patio has an area of 153 square feet. How long is each side of the patio to the nearest tenth? Each side of the patio is approximately feet long.

Solve the system of equations. x=y-9 8x-y=0 X=? Y=?

If a sequence is defined recursively by f (0) = 2 and f (n + 1) = - 2f (n) + 3 for n ≥ 0, then f (2) is equal to

Vertex of - 2 (x+3) ^2+7

Boat 1 leaves a dock headed due west at 8:00 AM traveling at a speed of 12 mph. At the same time a boat 2 leaves the dock headed due south traveling at a speed of 24 mph.

A Mathematics test was taken by 4 boys and 6 girls. The mean marks of the 10 students was 49. a) Calculate the total marks obtained by 10 students. b) If the mean marks of 6 girls was 51, calculate the mean marks of 4 boys.

Find an equation using absolute value that has the given solutions, a. two solutions, 22 and 22 b. two solutions, - 51 and 5 c. two solutions, - 9 and 39 d. one solution, 18