I have 3 questions I need help solving.

1. Simplify. Express answer in terms of sine and/or cosine.
Sinθ/Cscθ =

A. 1
B. sin²θ
C. csc²θ

2. Simplify. Express answer in terms of tangent and/or cotangent.
Tanθ/Cotθ =

A. tan²θ
B. cot²θ
C. 1

3. Simplify. Express answer in terms of secant and/or cosecant.
Secθ/Cosθ =

A. 1
B. cos²θ
C. sec²θ

What is the volume of a cone with a height of 6 cm in the radius of 2 cm

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.

What is the distance between the points (2, 5) and (5,9)?