Answer:
Step-by-step explanation:Since we want to know how much time elapsed since the object was launched until it ht the ground. At the ground, the height is 0.
  
Therefore the equation  h(t) = 80t – 16t2 becomes 0= 80t – 16t2
  
Solving the equation for t gives  80t =16t2 or 16t=80 or t=5sec
  
The object hits the ground 5 seconds after it is launched.
 
        
             
        
        
        
1. You have that the rule for a number pattern is add 4 and the <span>first term is 7.
 2. Let's call "n" to the number in the line where each student is. Then, you can express this as below:
 4n+7
 3. So, you have:
 Student N°1=4(1)+7=11
</span> Student N°2=4(2)+7=15
 Student N°3=4(3)+7=19
 Student N°4=4(4)+7=23
 Student N°5=4(5)+7=27
 Student N°6=4(6)+7=31
 Student N°7=4(7)+7=35
 Student N°8=4(8)+7=39
<span>
 What number should Jenna say?
 The answer is: 39</span>
        
             
        
        
        
Answer:
theta = 48.190
Step-by-step explanation:
Answer: θ = 48.2°
Step-by-step explanation:
The left side of the given triangle is a right triangle with base (adjacent to θ) = 2 and hypotenuse = 3
rounded to three significant digits = 48.2°
 
        
             
        
        
        
Answer: f(30) = -1 
You would substitute every X with 30