Which point(s) are on the graph of the following parametric equations?

1 answer:

5 0

<span>x(t)=2t
y(t)=t^2
A) (-4,4),
x(t)=2t=-4, t=-2
y(-2)=(-2)²=4 , True

</span>B) (-2,-4)
x(t)=2t=-2, t=-1
y(-1)=(-1)²=1 False. we have y=-4

C) (0,0)
x(t)=2t=0, t=0
y(0)=(0)²=0 True

D)(1,2)
x(t)=2t=1, t=1/2
y(1/2)=(1/2)²=1/4 False. we have y=2

E) (6,9)
(-2,-4)
x(t)=2t=6, t=3
y(3)=(3)²=9 True.

Correct answers is A, C, E.

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What's something that could go wrong if you use numbers that are not precise?

Strike441 [17]

Answer:

There are a lot of things that can go wrong, especially when we have an error in a measure that we use a lot of times (each time, that error increases).

For example, you think that each meter of fence costs $5, but the actual price is $5.30, and you need 40 meters, then you think that you may need to pay:

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3 years ago

Which of the following sets would have a graph with an open circle on 5 and a ray pointing right on the number line?

vaieri [72.5K]

<h3>Answer: Choice C $\{x | x \in \mathbb{R}, \ x > 5 \}$ </h3>

The open circle means we do not include the endpoint, hence the use of a greater than symbol. If we were to include the endpoint, then we'd have greater than or equal to. We can rule out choice B due to this reasoning.

The ray pointing to the right indicates we are talking about x values larger than 5, so we can rule out choice A and conclude the answer is C.

Side note: The notation $x \in \mathbb{R}$ is saying "x is a real number"