Show me how you find the measure of side b and what b measures

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Which shows the correct solution of the equation 1/2a+2/3b=50, when b=30?

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

The formula for the volume of a right square pyramid is given below, where a is the side length of the base and h is the height.