NEED HELP ASAP - 60 Pts. + BRAINLIEST for the best answer!!! (Please show your work)

Question:
A stretched string fixed at both ends is 21m long.
A) What wavelength would produce a 7th harmonic standing wave?
B) If the speed of the wave on the string is 20 m/s, what frequency would produce a 7th harmonic standing wave?

answer: first option i.e. 'a' is correct.

step-by-step explanation:

since we have given that

number of minutes to wrap a small gift box = 4 minutes

we need to find the number of gifts to be wrapped in 5 minutes

since there is a direct variation, as the number of minutes will increase with   number of gifts to be wrapped.

so, let the number of gifts to be wrapped in 5 minutes be x.

so, it becomes,

hence, first option 'a'   is correct.

do have an equation or graph or

step-by-step explanation:

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here's a poem i finished a while ago. i hope you like it and that it inspires you.