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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'

Landon wrote that 3−2.6=4. which statement about his answer is true?

Carley bought a jacket that was discounted 10% off the original price. the expression below represents the discounted price in dollars, based on x, the original price of the jacket.