The point R is halfway between the integers on the number line below and represents the number ____. (Use the hyphen for negative numbers and write the answer as a decimal, such as -6.4). Number line from negative 10 to positive 10 in increments of 1 is shown. Only the whole numbers are labeled. In between the whole numbers, there should be a tick mark. A point labeled R is placed between the 5th and 6th tick marks to the left of 0.