# Algebra--Help needed!

posted by .

Does anyone at least slightly understand direct and inverse variation? I get the basic idea, but I'm still a little confused, especially with inverse variation.

What I'm having more trouble with is conversion using direct and inverse variation. Today, my teacher kept talking and talking and wouldn't explain things very well, and there was no time for questions. Does anyone know the answer to this question? For any of my questions, please tell me the answer and walk me through it, too, because that is exactly what my teacher didn't do.

#1: Given that 1 inch is 2.54 centimeters and 1 ounce is 28.35 grams, convert 16.2 inĀ²ozˉˡ (that is to the power of negative 1) to centimeters and grams.

I think we did that one in class, but I'm kind of confused about how to get the answer.

#2: A molecule is traveling at a speed of 400 meters per second. What is its speed in miles per hour? Given: 30 centimeters = 1 foot, 3600 seconds = 1 hour.

Thank you so much! I appreciate any help, even if you can only answer one!

• Algebra--Help needed! -

If one variable = constant times other variable, that is DIRECT
example y = 5 x
If one variable = constant OVER other varible, that is INVERSE
example y = 5 / x

• Algebra--Help needed! -

For unit conversions I like to think about one thing / the same thing = 1

For example if I want to convert 4 feet to inches.
write
4 ft
now multiply that 4 ft by something that is inches over feet, but the same top and bottom so it does not change the basic quantity.
4 ft ( 12 in/ 1 ft)
the ft cancels and we are left with inches
4 * 12 = 48 inches
Now yours:
16.2 in^2/oz * (2.54 cm/1 in)(2.54 cm/1 in)(1 oz/28.35 g)
= 3.69 cm^2/g

• Algebra--Help needed! -

A molecule is traveling at a speed of 400 meters per second. What is its speed in miles per hour? Given: 30 centimeters = 1 foot, 3600 seconds = 1 hour.

400 m/s * (100 cm/1m)(1 ft/30 cm)(1 mi/5280 ft)(3600 s/1h)

## Respond to this Question

 First Name School Subject Your Answer

## Similar Questions

1. ### Math- steve or ms. sue

does the data in the table represent a direct variation or an inverse variation?
2. ### Algebra 2

I am trying to figure out if these problems are Direct Variation, Inverse Variation, or Neither. Could someone please check my answers?
3. ### Algebra 2

Is the relationship between the variables in the table a direct variation, an inverse variation, both, or neither?
4. ### Algebra 2 Honors

Hey, we recently started a topic in class that I don't understand well, I just want to post 6 of the problems and ask if they're right or not (some of them I have no idea how to do). 1. If a varies directly as b and b = 18 when a = …
5. ### math

Is the relationship between the variables in the table direct variation, inverse variation, both, or neither?
6. ### Algebra

Does the data in the table represent a direction variation or an inverse variation, write an equation x 1 2 5 10 y 40 20 8 4 My answer is a direct variation, y=40x, is this correct?
7. ### algebra 1

PLEASE HELP Come up with and describe two scenarios: one that models a direct variation situation and one that models an inverse variation situation. Do not state explicitly which scenario is which, but provide at least four data pairs …
8. ### Algebra

I am totally stuck on this question, can some one help?
9. ### Algebra2

Does the relation in the table represent direct variation, inverse variation, or neither?
10. ### Math

Does the relation in the table represent direct variation, inverse variation, or neither?

More Similar Questions