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3 years ago

Choose all the answers that apply. Which of the following is an example of an ion? Ar Na+ F+ Cl-

Mathematics

2 answers:

lesya692 [45]3 years ago

7 0

Answer:

Na+ and Cl- should be examples of an ion.

professor190 [17]3 years ago

3 0

Answer:

The answer would be Na+ and Cl-

I got this question at school

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A researcher interested in the effects of humor on memory randomly assigns 16 participants to either the humor group or the no-h

masha68 [24]

Answer: option c

Step-by-step explanation: with a two-tailed hypothesis she can find the way to go deep on the study, she will be able to increase the statistical power. She will be able to separate in specifics groups.

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3 years ago

Find an equation for the line through (-7,7) and parallel to y=2x-3

kaheart [24]

The answer would be B because a line is a parallel as long as the mx remains the same

Hope this helped.

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3 years ago

16. A negative number x a negative number is always positive. * true false nositi

xenn [34]

Answer:

True.

Step-by-step explanation:

I don't know the explanation behind any of it, but a negative number, when multiples by another negative number, is always positive.

3 0

2 years ago

A baseball is hit into the air, and its height h in feet after t seconds is given by h(t)= -16t^2+128t+2. The height of the bas

tankabanditka [31]

Answer:

$\large \boxed{\sf \ \text{2 feet, 4 seconds, 258 feet } \ }$

Step-by-step explanation:

Hello,

To know the height of the baseball when it is hit we have to compute h(0), as t = 0 is when the baseball is hit into the air.

$h(0)=-16\cdot 0^2+128 \cdot 0+2=2$

So, the answer is 2 feet.

h(x) is a parabola which can be written as $ax^2+bx+c$ , it means that the vertex is the point (-b/2a,h(-b/2a)).

The baseball reached its maximum height after

$\dfrac{-b}{2a}=\dfrac{-128}{-2*16}=\boxed{4 \text{ seconds}}$

And the maximum height of the baseball is h(4).

$h(0)=-16\cdot 4^2+128 \cdot 4+2=-256+512+2=\boxed{258 \ \text{feet}}$

Hope this helps.

Do not hesitate if you need further explanation.

Thank you

8 0

3 years ago

A cheetah can run 70 miles per hour. what is this speed in feet per hour? explain work,

MArishka [77]

So 70 miles per hour is 70 mile/1hour
1 mile=5280 feet
70 tmes 5280=feet=36,960

so 36,960 feet per hour

8 0

3 years ago