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[-/1 Points] DETAILS WANEAC7 6.4.045. MY NOTES PRACTICE ANOTHER Calculate the total area of the region described. Do not count area beneath the x-axis as negative. bounded by the line y = x, the x-axis, and the lines x = 0 and x = 9 Need Help? Read It Watch It [-/1 Points] DETAILS WANEAC7 6.4.052. MY NOTES PRACTICE ANOTHER Calculate the total area of the region described. Do not count area beneath the x-axis as negative. HINT [See Example 6.] Bounded by the curve y = 1x², the x-axis, and the lines x= -1 and x = 2 Need Help? Read It Watch It [-/1 Points] DETAILS WANEAC7 6.4.057. MY NOTES PRACTICE ANOTHER -dollars per box. Determine how much is added to the total The marginal cost of producing the xth box of light bulbs is 4 + cost by a change in production from x= 30 to x = 90 boxes. 1,000 Need Help? Read It Watch It