How many significant does 0.00400 have?

What sensory impairment from congenital toxoplasmosis may appear months or years after birth? Does the roman number system have method to multiply and divide? Is a parrellelogram a plane figure with four straight sides and four angles? What is the value of the discriminant of the polynomial 3x²-7x plus 4? What is it called an apple when you slice it into 800 parts? What are three numbers less than one hundred with exactly four factors? What is the 99th term in counting by twos? What is 2432902008176640000? What is the formula for calculating thermal power? What is 7186 rounded to the nearest tens place? What is the fraction for 31.375? Can 3 over 21 be simplified? How much interest is earned 1000 x 2.5 percent for 8years? How many times does 9 go into 34? What is 0.66 as a mixed number or fraction? What times equals to 105? What does n plus 4n-3 equals? What is the simplified mixed number form of 3.84? What is 18 x 16mm in inches? What is 9 20ths written as a decimal?