20% of what amount is $1.80?

Prove that the sum of two consecutive exponents of the number 5 is divisible by 30.if two consecutive exponents are 5n and 5n + 1, then their sum can be written as 30.

Which basic geometric term has no width, no length, and no thickness? line b. point c. angle d. plane

Solve the equation -9p - 17 =10 a -3 b. 16 c. 18 d -16