He already has two boards that measure 9 feet and 12 feet. Select all of the values that could represent the length of the third board of his triangular sandbox.

Picture containing the options is attached below

9 feets, 15 feets, 19 feets

Explanation:

15, 30, 21

Given that the length of two of the 3 sides aee:

9 feets and 12 feets.

If the 3 sides are a, b and c

a = 9 feets ; b = 12 feets

The length of side c, could be any value between the difference of the two Given sides or the sum, Thus ;

(a - b) < c < (a + b)

(12 - 9) < c < (12 + 9)

3 < c < 21

Hence, c coukd be values between 3 and 21

9 feets, 15 feets, 19 feets

community or area create social relationships that typically differ greatly from the affiliations ultimate effects of travel experiences on the population in areas of origin, as well as in places of wage of only a dollar or two. motorcoach operators, museums, and restaurants fall into the broad category of public

explanation: