Write a number sentence to represent the sum modeled on the number line. In two or more complete sentences, explain your reasoning.

2-digit numbers less than 91 which are 1 less than a multiple of 10

How can (square root of 25) ^2 be rewritten?

Jonathan can type 20 documents in 40 minutes ,and susan can type it in 30 minutes and jack can type it in 24 minutes working together ,how much time will it is take them type the same document