The sum of 2018 and a 3-digit number is a square number. Find the smallest possible value of the 3- digit numbers

Find the sum of the greatest 3-digit number and the smallest 2-digit number.
Answer: The sum is 

in a 4-digit number, the ones digit is the possible largest number, the hundreds digit is the smallest odd number and the tens digit is 1 more than the hundreds digit. The thousands digit is the sum of the hundreds and the tens digit. Find the number

In a 4-digit number, the ones digit is the possible biggest number, the hundreds digit is the smallest odd number and the tens digit is 1 more than the hundreds digit.  The thousands digit is the sum of the hundreds and tens digit . Find the number. nhanh lên nhé

:
In a 4-digit number, the ones digit is the possible largest number, the hundreds digit is the smallest odd number and the tens digit is 1 more than the hundreds digit. The thousands digit is the sum of the hundreds and the tens digit. Find the number.
Answer: The number is 

1,3. Find the smallest odd three-digit multiple of 11 whose hundreds digit is greater than its units digit. 

2,4. Find the sum of all the integers between 150 and 650 such that when each is divided by 10, the remainder is 4.

Giúp mình nha

a) find the next two term in the sequence: 1; 4; 9; 16; 25;....;.....;
Answer: 
b) find the smallest two-digit number whose number is 7 times the sum of its digits? 
Answer:

Câu 9:
The average mass of a group of children is 47kg. If  of the number of children are girls and their average mass is 39kg. Find the average mass of the boys.
Answer: The average mass of the boys is kg
 

Câu 10:
A 6-digit number begins with the digit 8. The number is divisible by 9 and all digits of the number are different. What is the possible smallest value of this number?
Answer: 

If A is divided by 9 then the sum of the quotient and 9 is the greatest 2-digit number. Find the value of A. Answer: A =