Prove that 9^3/2 -3 *5^0 -(1/81)^-1/2 = 15 Pls help, correct answer, I’ll mark as brainliest

Which of the following represents a number squared is equal to twenty more than nine times that number ? a) x squared = 9x + 20 b) x squared = 20x + 9 c) x squared > 9 + 20x d) x squared = 9 + x + 20

What is the lcm of 16 and 40 ? 24 and 40 ?

Simplify (2^5/3^2)^4 a. 2^20/3^8 b. 2^9/3^8 c. 8^5/12^2 d. 2/3^2