How do you think altering factors like wavelength and frequency affect they way we see and hear? how does this us understand how things like lenses

Wavelength and frequency are inversely related, meaning that if you increase the frequency, the wavelength decreases, and if you decrease the frequency, the wavelength increases. This means that we only can think in of these two to change (because the other changes along with it) I will select the frequency.

Now, let's think about the sound, suppose you have a given wave if you increase the frequency, then the pitch of the sound also increases, and you have a "higher" sound, if you decrease the frequency, you have a "lower" sound, more bass.

For the visible light, if you decrease the frequency of a wave, the energy increases, and the light turns to the blue side of the spectrum if you increase the frequency, the light turns more reddish, and the energy decreases.

one person pulls 90n one way and the other has 100n pulling the other way.

so the net force = 90 - 100 = -10n,

or the ans can be 10n if the picture shows -90n and 100n instead.

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2