Answer:
To approximate the value of √39 using a number line, we can locate the nearest whole numbers that √39 falls between.
√36 = 6, and √49 = 7
Since 39 falls between 36 and 49, we know that √39 will be slightly greater than 6 and slightly less than 7.
Among the given options, the closest approximation to √39 on the number line is 6.25. Therefore, the approximate value of √39 is 6.25.