Pls help i am in k12

What is r i 4.5+10r=-6.5 with work pls

He letter p on the number line below represents the number . (use the hyphen for negative numbers and write answer as a decimal, such as –7.2) number line from negative 7 to positive 7 in increments of 0.5 is shown. only the whole numbers are labeled. a point labeled p is placed at the eleventh tick mark to the left of 0.

What is the sum of the measures of the interior angles of an octagon