What is the expression in simplest radical form?

Whit h equation best represents this situation the number 98 increased by an unknown number equal to 120

Yesi's dog weighed 5 pounds when she got him. he now yesi's dog weighed 5 pounds when she got him. he now weighs 45 pounds. how much did yesi's dog gain, in ounces?

The sales tax for an item was $8.40 and it cost $420 before tax. find the sales tax rate. write your answer as a percentage.