Which number sentence is true?A.-1.5 + (-0.5) = 2.0B.2.5 + (-1.5) = 1.0C.-1.5 + (-0.5) = -1.0D.-2.5 + 3.5 = -1.0
1 answer:
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Answer:
t = 4 seconds
Step-by-step explanation:
The height of the projectile after it is launched is given by the function :
t is time in seconds
We need to find after how many seconds will the projectile land back on the ground. When it land, h(t)=0
So,
The above is a quadratic equation. It can be solved by the formula as follows :
Here, a = -16, b = 32 and c = 128
Neglecting negative value, the projectile will land after 4 seconds.