Problem Choice 2.1. In this problem, we will consider a filter that is shaped as a lower semi- sphere. The picture below shows a spherical filter with water filled to level h. The following formulas are essential for a completion of this work. Th² (R h • The volume of water filled to level h in a spherical bowl with radius Ris given by V : 3 • Another crucial formula is A = 27R h, for the surface area of the part of the sphere that is in contact with the body of water.

I have this question on my homework and I don't see a pattern. I have to explain how the trick works.  "Think of a number. Add 17. Double the result. Subtract 4. Double the result. Add 20. Divide by 4. Subtract 20. Your answer will be your original number."

Find the first 5 terms  a1 = 9; d = -2

Please finish the entire question; it has multiple parts.

Hey sorry it must have cut off but what would letter A be ?

My English is not good. Can you write your handwriting on the computer text?

Please help me answer the following questions. Thank you

Mr. Imperfecto teaches another math class.  This time he has 23 students take a test, the average score on which is an 87.  Mr. Imperfecto realizes he put the wrong grade in for a student.  He entered a 35, and the score should have been an 85.  To the nearest integer, what is the new class average?