The roof of a tower is in the shape of a square pyramid. The side length of the roof is 12 feet and the slant height is 10 feet 180 sq ft
192 sq ft
240 sq ft
480 sq ft

Ariana starts with 100 milligrams of a radioactive substance. the amount of the substance decreases by 20% each week for a number of weeks, w. the expression 100(1−0.2)w finds the amount of radioactive substance remaining after w weeks. which statement about this expression is true? a) it is the difference between the initial amount and the percent decrease. b) it is the difference between the initial amount and the decay factor after w weeks. c) it is the initial amount raised to the decay factor after w weeks. d) it is the product of the initial amount and the decay factor after w weeks.

The sum of the squares of two numbers is 8 . the product of the two numbers is 4. find the numbers.

Which number line correctly shows 0.8 + 0.3?