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–6
-2/3
3/2
6

Any ideas?

-2/3 would be my guess

Guessing randomly doesn't work in math :-)
Please give a reason.

because usually its x/y right? so the inverse would be y/x

So its 6?

no that doesnt make sense

Yes. 6 is correct :-)

Thank you! Can you help me with another one?

I can try.

Any ideas?

|dw:1438892577073:dw|

so find y=3x10^8/x

Read the problem carefully.
Decide what unknown number is being asked for.

3x10^9?

that's not an answer choice

I still dont understand

what is the question asking for?

What is the wavelength for radio waves with frequency 3 × 10^9

Good, where is the wavelength in the formula they gave you?

wavelength is x and frequency is y

so they want you to find x, right?

yes

|dw:1438893690522:dw|

|dw:1438893825211:dw|

Ok so far?

yes

Do you know how to solve for x?

I plugged it in but it came out to be 1

plugged what in?

is it A?

(3*10^9)=(3*10^8)/x

x=1/10

Correct :-)

Thank you!

Thanks for trying :D