Answer:
b ≈ 1.9
Explanation:
Using the tangent ratio in the right triangle
tan23° = = ( multiply both sides by 4.5 )
4.5 × tan23° = b , then
b ≈ 1.9 ( to the nearest tenth )
7.1
Use the trig ratio tan to find b
4.5 x tan (23) = b = 7.14668887526
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= 
( multiply both sides by 4.5 )