I’ll mark u as a brainliest!! pls help me

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

Desmond wants to sell his car that he paid $8,000 for 2 years ago. the car depreciated, or decreased in value, at a constant rate each month over a 2-year period. if x represents the monthly depreciation amount, which expression shows how much desmond can sell his car for today? \ 8,000 + 24x 8,000 - 24x 8,000 + 2x 8,000 - 2x