Step-by-step explanation:
using trig, tangent is equal to opposite over adjacent.
in this case, the angle is 45, opposite is 7, and adjacent is a.
thus tan 45° = 7/a
solve for a to get a = 7/tan 45° = 4.32

➳This number can be written in scientific notation as 1.86 times a power of 10.
Answer:
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Step-by-step explanation:
:)