Answer:
At 43.2°.
Step-by-step explanation:
To find the angle we need to use the following equation:

Where:
d: is the separation of the grating
m: is the order of the maximum
λ: is the wavelength
θ: is the angle
At the first-order maximum (m=1) at 20.0 degrees we have:

Now, to produce a second-order maximum (m=2) the angle must be:


Therefore, the diffraction grating will produce a second-order maximum for the light at 43.2°.
I hope it helps you!
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sales tax = 7 1/2% = 7.5% = 0.075
89.25(1.075) = $ 95.94 <===
Answer:
the answer to your question is (9,3)
The first one, the other graphs do not pass the Vertical line Test. they intersect at more than one point on the graph