17
it's 17+(-7)=10
i hope that answers your problem
9 friends
23 2/5 bags of apples
23 2/5 = 23.4
23.4 / 9 = 2.6
each friend may take 2 3/5 bags
There exists the same question from other source that has the image of the drawing. Attached to this answer is the image.
To solve this, first we have to assume ratios.
Real Height / Shadow = 56 / 49
Real Height / 28 = 56 / 49
49 * h = 56 * 28
49h = 1568
Then, we have to divide both sides by 9
h = 32
Therefore, the obelisk is 32 ft
C is correct answer to this question.