Miguel is 4 years older than of Harper's age. The sum of their ages is 34 yr. what is Harper's age?

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Subscriptions to a popular fashion magazine have gone down by a consistent percentage each year and can be modeled by the function y = 42,000(0.96)t. what does the value 42,000 represent in the function?

Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'