you find a rock containing a mixture of element and lead. you determine that 20% of the orignial element remain; the other 80% decayed into leads. how old is the rock?

What is the approximate area of the regular pentagon?

What missing number would complete the factorization? x2 - 7x + 10 = (x - 5) (x - ?) A. 1 B. 2 C. 4 D. 5

Niña has half a pound of grapes. she wants to divide this amount among 4 friends. How many pounds of grapes does each friend get?

What is 3.6 divided by 81

I want to use 376 ft of fencing to fence off the greatest possible rectangular area what would be my dimensions to use for the garden

What is the area of this rectangle in square feet? its width is 6 yards and its height is 4 yards A. 288 square feet B. 24 square feet C. 216 square feet D. 72 square feet

Carl received 2/5 of the votes, Gilda received 10% of the votes, and Conroy received 1/4 of the votes. if Kyla received all of the remaining votes, what percentage of the votes did she receive?

We start with triangle ABC and see that angle ZAB is an exterior angle created by the extension of side AC. Angles ZAB and CAB are a linear pair by definition. We know that m∠ZAB + m∠CAB = 180° by the.

In simplest radical form, what are the solutions to the quadratic equation 0 = - 3x2 - 4x + 5

Consider the region bounded by x2 + y2 = 64 with x ≥ 0, and y ≥ 0 . A solid is created so that the given region is its base and cross-sections perpendicular to the x-axis are squares.