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Find the length of CD

Solve the following pair of equations for x and y: ax/b_ by /a= a +b; ax - by = 2ab

Solve the equation. 2x - 8(x+1)= 6(2x - 3)

Asunflower was 20 1/2 inches tall. over the next 6 months, it grew to a height of 37 inches tall. what was the average yearly growth rate of the height of the sunflower? ? plz write a proportion to solve i will give you 100 points