Answer:
i think it is 7 i just looked it up but it might be accurate
any more help just ask :)
Answer:
t = .64sec and t = 1.56sec
Step-by-step explanation:
This is motion that is modeled by a parabola. The nature of a parabola is symmtrical about some vetical line. That means that if there is an x value where y = 3, for example, when the object is traveling upwards, it will come down after it reaches its max height and be at that same y = 3 height, just at a later time. By this, I mean that you will have 2 times where the height is 7. Besides that, this is a second degree polynomial, so we are expecting 2 values of t.
We are asked to find these 2 times when the height, h, is 7. So we will fill in a 7 for h and factor to solve for t:
![7=-5t^2+11t+2](https://tex.z-dn.net/?f=7%3D-5t%5E2%2B11t%2B2)
To factor this quadratic, we need to get everything on one side of the equals sign and set it equal to 0:
![-5t^2+11t-5=0](https://tex.z-dn.net/?f=-5t%5E2%2B11t-5%3D0)
Factor this however your teacher has instructed you to factor quadratics (my guess is that you're probably using the quadratic formula) to get t values of:
t = .64 sec and t = 1.56 sec
Answer:
where is the hint
Step-by-step explanation:
you might want to try reading the hint
Hello there,
<span>Which of these is a common characteristic of cnidarians?
</span>All Cnidarians<span> have tentacles with stinging cells in their tips which are used to capture and subdue prey.
</span>
Therefore, your answer would be
<span>They have tentacles with stinging cells. (OptionB)
</span>