Answer:
a) 
b) t = 0.3 seconds
c) d = 4.9t²
d) d = 11 cm.
Step-by-step explanation:
One test involves catching a 1 m ruler and measuring the distance, d in meters, that the ruler will travel before being caught, the reaction time t in seconds is then calculated using the formula
.......... (1)
a) the simplified expression is
......... (2)
b) If d = 44 cm = 0.44 meters, from equation (2) we get,
t = 0.299 seconds ≈ 0.3 seconds (Approximate)
c) If we make d as the subject of the equation, then

⇒ d = 4.9t² .......... (3)
d) Now, if
seconds, then from equation (3) we get,
d = 4.9 (0.15)² = 0.11 meters = 11 cm (Answer)
Step-by-step explanation:

First, let's distribute the terms outside each parentheses to get rid of them:


Next, let's move the terms with an
variable to the left side of the equation, and everything else to the right side:


Answer:
Step-by-step explanation:
Srry
First find height using Pythagorean theorem.
.
Then use cone surface area formula and compute the result:
.
Hope this helps.
Answer:
Step-by-step explanation:
hope it helps you