Find the percent error in this situation: Estimated value: 1081 Actual value: 1150

Ten times the square of a non-zero number is eqaul to ninety times the number

Through non-collinear points there is exactly one plane.

How many 3-digit numbers can you write using only digits 1 and 7? (of course, digits can repeat.) how many 3-digit numbers can you write using only digits 1 and 7? (of course, digits can repeat.)