What percent of a sample of As-81 remains un-decayed after 132 seconds?

You are comparing phone plans. Q company charges a one time fee of $25 and then $3 per month. W company charges a one time fee of $60 and then $1 per month. How many months until the two companies have the same cost?

Walter owns 60 books now. He plans to buy 10 books every month. Which recursive formula gives the number of books Walter will have in any month in the future? A.) next = now + 10, starting at 60 B.) next = 60 * now + 10 C.

What are the first four terms of a geometric sequence if the common ratio is 10 and the first term is 4.5?

Steve needs to take at least 24 milligrams of calcium, 15 milligrams of iron, and 16 milligrams of vitamins.

A woman takes 121212 equal-sized steps. She walks a total of 10 / text { yards}10 yards10, start text, space, y, a, r, d, s, end text. How many inches long is each step? inches

Two equivalent decimals for 2.50

Lines j, k, m, and n lie in a plane. You know line j is perpendicular to line n, m is perpendicular to line n, and line k is parallel to line m. What can you conclude? A. Line n is parallel to line k. B. Line k is perpendicular to line j. C.

Simplify this - 6r• (12s)

Suppose you take an 80 question mc test with 5 choices if 60% is passing, what are your chances of passing

What is the 14th term of the arithmetic sequence with a first term of 7 and a common difference of 10?