<u>Answer:</u>
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The length of the side is 33 yards.
<u>Step-by-step explanation:</u>
<em>We can solve for 'b' using Pythagoras theorem. Let's solve it.</em>
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65² = b² + 56²
- => 4225 = b² + 3136
- => b² = 1089
- => b = 33
Hence, the length of the side is 33 yards.
Hoped this helped.

Answer:
45.27feet
Step-by-step explanation:
Given the height of the balloon (in feet) represented by the equation h=−16t2+28.7t+32.4, where t is the time (in seconds)
Note that the velocity of the balloon at maximum height is zero, hence;
v = dh/dt =0
-32t+28.7 = 0
-32t = -28.7
t = 28.7/32
t = 0.897secs
Get the maximum height
Recall that h=−16t²+28.7t+32.4
h = -16(0.897)²+28.7(0.897)+32.4
h= -12.87+25.74+32.4
h = 45.27feet
Hence the maximum height reached is 45.27feet
I don't know about the first one but for the second one:

N=-2
Add 42 to both sides to get -6n=12
Divide both sides by -6