First write out all the two digit square numbers
4² = 16
5² = 25
6² = 36
7² = 49
8² = 64
9² = 81
Next divide all of them by 7
16/7 = 2 2/7 or 2 and 2 remainders
25/7 = 3 4/7 or 3 and 4 remainders
36/7 = 5 1/7 or 5 and 1 remainder
49/7 = 7
64/7 = 9 1/7 or 9 and 1 remainder
81/7 = 11 4/7 or 11 and 4 remainders
This tells us that the only possible remainders for a two digit square number divided by 7 are 1, 2 and 4
If Doris got 6 and Horace got 3, they must have made a mistake.
1 because -2+3=1 hahahahahah it's telling me my answer needs to be at least 20 characters long :')
For this case we have that the equation that describes the height is:

Where,
v: initial speed
c: initial height
Substituting values we have:

Then, to find the time, we use the quadratic formula:

Substituting values we have:

Rewriting:



We discard the negative root because we want to find the time.
We have then:


Answer:
D. 
The answer is -16. your welcome