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?

This is the sum of the lengths of all the sides of a polygon, expressed in linear units

What is the forecast for period 16 using the three-period weighted method? (weights are t=0.5, t-1=0.4 and t-2=0.1) a. less than or equal to 890 b. greater than 890 but less than or equal to 900 c. greater than 900 but less than or equal to 910 d.

What is the greater two years for 14 months

A symphony has 125 musicians. 75 are women. Which ratio of the men to the total musicians

Lance armstrong won his fourth straight tour de france bike race in 2002. he is able to travel at 32 miles per hour for an hour without resting. at this rate how many feet per second he would be traveling?

Kelly has a ribbon that is 60 inches long she cuts at 40% of ribbon for an art project while working on the project she decided she only needs 35% of the pieces she cut off how much of the ribbon does Kelly end up using in a project

Which expression is equivalent to x (y+z) ? a) xyz b) x+y+z c) xy+z d) xy+xz

8.92*10^9 in standard notation

On a test Matilda answered 12 out of the first 15 correctly. If this rate continues how many of the next 25 problems will she answer correctly?

Which expression shows the value of a $10,000 investment that has lost 1.2% if it's value for five years In a row