1. 5. what is the frequency of a wave that has a wave speed of 120 m/s and a wavelength of 0.40 m

300 Hz

Step-by-step explanation:

Something may be wrong on my end because I only see a question labeled 5. Anyways, you can basically just follow the units here.

So in order to use the given info to get the correct units...

Plugging in or knowns gives us:

Frequency = (120/.4) = 300 Hz

This might be an informal way to think about it technically but it's a good way to do it nonetheless.

i'm sure goog can you get that answer

∠1≅∠2 by the alternate exterior angles theorem.

step-by-step explanation:

given, a ∥ b and ∠1 ≅ ∠3 .we have to prove that e ∥ f

we know that ∠1≅∠3 and that a || b because they are given. we see that by the alternate exterior angles theorem. therefore, ∠2≅∠3 by the transitive property. so, we can conclude that e || f by the converse alternate exterior angles theorem.

we have to fill the missing statement.

transitivity property states that if a = b and b = c, then a = c.

now, given ∠1≅∠3 and by transitivity property ∠2≅∠3 .

hence, to apply transitivity property one angle must be common which is not in result after applying this property which is ∠1.

the only options in which ∠1 is present are ∠1 and ∠2, ∠1 and ∠4

∠1 and ∠4 is not possible ∵ after applying transitivity we didn't get ∠4.

hence, the missing statement is ∠1≅∠2.

so, ∠1≅∠2 by the alternate exterior angles theorem.