The area of a square poster is 26in squared. Find the length of one side of the poster to the nearest tenth of an inch

In a two-digit number the units' digit is 7 more than the tens' digit. the number with digits reversed is three times as large as the sum of the original number and the two digits. find the number.

Which of the following statements would be sufficient to prove that parallelograms pqrs is a rectangle ?

Sam opened a money-market account that pays 3% simple interest. he started the account with $7,000 and made no further deposits. when he closed the account, he had earned $420 in interest. how long did he keep his account open?