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liubo4ka [24]
3 years ago
15

I neeeeeeeeeeeeeed help

Mathematics
2 answers:
Firlakuza [10]3 years ago
6 0
It’s D it’s the last one
snow_lady [41]3 years ago
3 0

Answer:

it should be C) 2+1=3

Step-by-step explanation:

the identity property is when zero is added to any number, or any number is multiplied or divided by 1, and in the end you get the original number.

Process of elimination:

5/1=5, so 5=5, that can't be the answer.

4x1=4. 4=4, that cant be the answer either.

3-0=3, and 3=3, thats also part of the identity property.

2+1=3, 2 does not =3,

therefore c is the only option not showing the identity property.

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3 years ago
The height 'h' (in feet) of a ball in a baseball game can be modeled by h = -16t² + 28t + 8 , where 't' is the time (in seconds)
lidiya [134]

Answer:

  a)  No. t < 0 is not part of the useful domain of the function

  b) 2.0 seconds

Step-by-step explanation:

a) A graph of the function is shown below. It shows t-intercepts at t=-0.25 and t=2.0. We presume that t is measured forward from some event such as the ball being thrown or hit. The model's predicted ball location has no meaning prior to that event, when values of t are negative.

__

b) It is convenient to use a graphing calculator to find the t-intercepts. Or, the equation can be solved for h=0 any of several ways algebraically. One is by factoring.

  h = 0 = -16t² +28t +8 . . . . . . . . . . . . the ball hits the ground when h = 0

  0 = -4(4t² -7t -2) = -4(4t +1)(t -2)

This has t-intercepts where the factors are zero, at t=-1/4 and t=2.

The ball will hit the ground after 2 seconds.

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