Answer:
C) 6.9 seconds
Step-by-step explanation:
h = -16t² + 96t + 100
When the ball hits the ground, h = 0.
0 = -16t² + 96t + 100
0 = 4t² − 24t − 25
Solve with quadratic formula:
t = [ -b ± √(b² − 4ac) ] / 2a
t = [ -(-24) ± √((-24)² − 4(4)(-25)) ] / 2(4)
t = [ 24 ± √(576 + 400) ] / 8
t = (24 ± √976) / 8
t = (24 ± 4√61) / 8
t = (6 ± √61) / 2
t = -0.91 or 6.9
Since t must be positive, t = 6.9 seconds.
Answer: -2/6 and -2/-6
Explanation: it doesn’t matter how many or where the negative signs are written on the fraction, it’s still negative.
2
and
7
~Mschmindy
P.S. I didn't really understand the question, sorry if I'm incorrect. :/
Answer:
A
Step-by-step explanation:
The reflexive property of congruence basically says that a segment is congruent with itself. B and C are related to angles so do not apply here.
You can set up the equation 3y=2r, with r standing for the amount of red paint in gallons, the same going for y. If you substitute in 8.5 for y, you get that 2r=25.5. Divie each side by 2, and r=12.75. So, Pedro uses 12.75 (or 12 and three-fourths) gallons of red paint.