20.41 is what the correct answe
Answer:
D
Step-by-step explanation:
In this problem, we are adding the two equations and we want to get rid of y. To do this, we want one positive y and one negative y with the same coefficient because when we add the equations they will cancel each other out. The coefficient of the first equation's y is 4, so we want the second to be -4. The coefficient of the second equation's y is -2, and if we want it to be -4 we multiply it by -4/-2= 2, which is D. Once you do that you will get 4y and -4y in the first and second equations respectively and then you can add them to eliminate y!
32/4 = 8
If 1 part of 8 is enough for 4 people than, 8 parts of 8 is enough for 32 people!
<em><u>I hope this helps and is better!</u></em>
Answer:
t = 3 s and t = 4 s
Step-by-step explanation:
Given that,
A projectile is fired straight up from ground level with an initial velocity of 112ft/s. Its height as a function of time t is given by :
We need to find the interval of time during which the projectile’s height exceeds 192 feet. It means put h = 192 feet
So,
The above is a quadratic equation, it can be solved using middle term splitting as follow :
Hence, at t = 3 s and t = 4 s, the projectile’s height exceeds 192 feet above the ground.
Add them both up and divided by 2, 52+45=97. 97/2 =48.5
Step-by-step explanation: