Help ready level H

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Look at the following graph of the given equation. determine whether the equation is a function. explain why or why not.

If private savings 'v' = 0.75s and total savings 's' equals $4.20 billion, solve for public and private savings.

List x1, x2, x3, x4 where xi is the left endpoint of the four equal intervals used to estimate the area under the curve of f(x) between x = 4 and x = 6. a 4, 4.5, 5, 5.5 b 4.5, 5, 5.5, 6 c 4.25, 4.75, 5.25, 5.75 d 4, 4.2, 5.4, 6