Could someone help me with these 4 MULTIPLE CHOICE questions? 10 points best answer?

Could someone help me with these 4 MULTIPLE CHOICE questions? 10 points best answer?
Question 17 (Multiple Choice Worth 6 points)

[8.05] MA.6.G.4.1

Isaac is cutting wood to build a clock. He wants the clock to have a long hand that extends from the center to the edge of the clock face. What must the approximate area of the face be if the hand he is using is 5 inches long? Use 3.14 for pi.

A) 19.63 sq in.
B) 31.4 sq in.
C) 62.8 sq in.
D) 78.5 sq in.

Question 18 (Multiple Choice Worth 6 points)

[8.04] MA.6.A.3.4

What is the exact diameter of an area rug with a circumference of 36 feet?

A) 18pi feet
B) 18/pi feet
C) 36/pi feet
D) 36pi feet

Question 20 (Multiple Choice Worth 6 points)

[7.01] MA.6.A.2.1

A recipe for molding dough calls for flour and salt in a ratio of 2 to 1. If you use 4 cups of salt, how much flour should you use?

A) 2
B) 4
C) 5
D) 8

Question 21 (Multiple Choice Worth 5 points)

[5.05] MA.6.A.3.3

For which equation would you use the operations of addition and multiplication to solve?

A) u/5 + 5 = 5
B) 5u + 5 = 5
C) u/5 - 5 = 5
D) 5u - 5 = 5