What it 18.93 in radical form

The triangles are similar. what is the value of x? show your work.

Imogene invested $8,000 in a bank account that pays 8 percent simple interest at the end of each year. her friend invested the same amount in stocks where the growth of the investment is represented as 2,000 times the square root of 2 less than the time lapsed in years. if y1 and y2 represent the amount earned in dollars and t is the time lapsed in years, which system of equations correctly represents the situation?

Eric drove 275 miles in 5 hours. at the same rate how long would it take him to drive 495 miles?