The circle has radius 21 centimeters. What is its area?
22
Use
as an approximation for
7
A 132 cm
B 346,5 cm
C 1,386 cm
D 5,544 cm

Ascientist has 50 grams of a radioactive element. the amount of radioactive element remaining after t days can be determined using the equation (1) after two days the scientist receives a second shipment of 50 grams of the same element. the equation used to represent the amount of shipment 2 remaining after t days is 10) - 50 which of the following is an equivalent form of the expression for the amount remaining in shipment 2? what’s the answer?